Does green tea have calories

No matter what the season, tea can be a tasty beverage since it can be served iced or hot.

But its benefits go far beyond refreshment. There is plenty of research showing that drinking tea can actually improve your health.

The newest study, published Thursday in the European Journal of Preventive Cardiology, involved more than 100,000 adults in China and found those who regularly drank tea were less likely to develop atherosclerotic cardiovascular disease or die prematurely from any cause — particularly stroke — compared to others during a seven-year follow-up.

The link was especially strong among habitual tea drinkers — those who enjoyed the beverage at least three times a week. Green tea seemed to have a stronger effect than black tea.

Based on the findings, a 50-year-old frequent tea drinker might develop heart disease almost a year-and-a-half later or live about a year longer than someone who never or seldom drank tea, the study authors wrote.

Aug. 9, 201902:15

The results suggest habitual tea consumption may be considered “as an overall health-promoting lifestyle behavior,” wrote Vanessa Bianconi, a researcher at the University of Perugia in Italy and lead author of an editorial accompanying the new research.

Tea’s ability to lower blood pressure may be why it could reduce a person’s risk of dying of a stroke, the editorial noted.

Tea, especially green tea, is a rich source of flavonoids, bioactive compounds that can lessen oxidative stress, relieve inflammation, and provide other health benefits, the study authors noted. They cautioned more research was needed to see whether the results in Chinese adults would also apply to people outside east Asia.

Other studies have shown teas can help protect your teeth and your heart, as well as possibly even helping to stave off cancer. At the very least, drinking tea is a flavorful way of getting enough fluid into your body each day.

Which type you drink can make a difference. All non-herbal teas are made from the leaves of the Camellia sinensis plant. The amount of time the leaves are processed determines whether you end up with a green, black or oolong tea.

The green teas are the least processed and tend to have the highest amounts of polyphenols, and the only type that contain the polyphenol, catechin, which is why many studies have been done using only green teas. Certain herbal teas are known for their medicinal values, including soothing the digestive system.

Here are the top 10 health benefits of tea and some options for delicious teas to try:


1. Tea contains antioxidants.

Antioxidants work to prevent the body’s version of rust and thus help to keep us young and protect us from damage from pollution. Load up on antioxidants with a white tea, which is less processed than black or green tea so it retains more beneficial antioxidants.

Vahdam Himalayan Imperial White Tea

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2. Tea has less caffeine than coffee.

Herbal blends have no caffeine, while traditional teas have less than 50% of what typically is found in coffee. That means you can consume it without those pesky effects on your nervous system, says Leslie Bonci, nutritionist and owner of Active Eating Advice. If you’re trying to switch from coffee to tea, try a chicory root tea like Teeccino, which has a mouth feel and flavor similar to coffee. Chicory root is also known to help reduce stress and is a prebiotic so may be helpful to your gut.

Bonus: this tea will give you a kick of energy without the caffeine.

Teeccino Herbal Coffee Tee-Bags

3. Tea may reduce your risk of heart attack and stroke

“There’s a lot of literature out there on tea and heart health,” said Anna Ardine, clinical nutrition manager at Magee-Womens Hospital of the University of Pittsburgh Medical Center. “This is a health effect for which there is the strongest evidence.”

In fact, a study published in 2016 that combined data from a host of earlier reports found a nearly 20% reduction in the risk of heart attack and a 35% reduced risk of stroke among those who drank one to three cups of green tea a day. Those who drank four or more cups of green tea daily had a 32% reduction in the risk of having a heart attack and lower levels of LDL cholesterol. Four cups of green tea may keep you running to the bathroom, but you can get the same benefit from drinking one cup of matcha tea, which is made from ground green tea leaves and is said to be the nutritional equivalent of 10 cups of regular green tea.

Starter Matcha 100% Organic Matcha

4. Tea may help with weight loss

Research on this isn’t as strong, Ardine said, adding that studies that have shown an effect have depended on consumption of large amounts of tea, often in pill form.

5. Tea may help protect your bones

Data from recent animal studies has shown that green tea may prevent bone loss. Moringa, a plant that’s native to South Asia, has been known for its medicinal properties and is now quickly becoming a mainstream superfood. With more calcium than milk, as well as iron, vitamin A and K, moringa tea is a great addition to help keep those bones strong.

The Republic Of Tea Organic Moringa Superherb Herbal Tea

6. Tea may keep your smile bright

“Japanese researchers have found that tea can decrease tooth loss,” Ardine said. “It changes the pH in your mouth when you drink it and that may be what prevents cavities.” Beyond that, tea, unlike many other beverages does not appear to erode tooth enamel, Bonci said.

7. Tea may boost the immune system

Studies have shown tea can tune up immune cells so they reach their targets quicker. Holy basil or tulsi tea has been used by Ayurvedic practitioners for centuries to help keep the immune system strong after injuries or illnesses thanks to its antibacterial, anti-fungal and anti-inflammatory properties.

Organic India Tulsi Tea

8. Tea may help battle cancer

Studies on this are currently mixed, which means more research is needed, Bonci says. But, in the meantime, “if you’ve got a strong family history of cancer and you want to do anything you can, you might increase your tea consumption,” she added.

9. Herbal tea may soothe the digestive system

“Herbal teas, in particular chamomile, can be good for people with irritable bowel syndrome because it is an antispasmodic,” Bonci said. “And ginger teas can calm nausea.” Get a dose of both with a ginger chamomile tea.

Traditional Medicinals Organic Ginger with Chamomile Herbal Leaf Tea

10. Tea — unadulterated, that is — is calorie free

“It’s a great no-calorie alternative to water,” Bonci said. “It provides so many options for flavor and versatility. You can have it hot or cold. And you don’t have to put anything in it, though you might want to add a cinnamon stick or some ginger. That means you’re able to hydrate with something other than water alone.”

Get yourself a cannister of Teabloom’s fruit and green tea variety packs and you’ll never get bored — or miss the sugar. With all-natural flavors like pineapple, acai berry, strawberry and litchi, you can easily keep your palate pleased.

Teabloom Flowering Fruit Teas

For more ways to get healthy in 2020, check out our list of favorite healthy cookbooks, our go-to veggie spiralizer that has over 4,000 positive reviews, or our list of the 17 best keto snacks.

TODAY’s A. Pawlowski contributed to this report.

Green tea is good for you, but only if drunk in moderation. While the polyphenols in green tea are credited with preventing heart disease and cancer, it seems they can cause liver and kidney damage if consumed in very large quantities, a review of studies into the toxicity of polyphenols has shown.

“People shouldn’t be too alarmed by this, but those taking supplements may experience problems,” says lead author Chung Yang of Rutgers, the State University of New Jersey.

He stresses that up to 10 small cups of green tea a day is fine. Problems are likely in people who take supplements, which can contain up to 50 times as much polyphenol as a single cup of tea.

Yang’s review cites experiments in which rodents and dogs died from liver poisoning when given very large doses of polyphenols. He also reports cases of people with liver toxicity after overdosing on green-tea-based supplements. Their symptoms disappeared when they stopped taking the pills, only to return when they started taking them again (Chemical Research in Toxicology, vol 20, p 583).

11 Harmful Green Tea Side Effects (Read Before Drinking)

Green tea is a healthy powerhouse that has taken the world by storm. It was first used in China as a medicinal herb. In modern times, it’s become a healthy elixir that millions of Americans consume each day. Today, scientists and researchers have completed thousands of studies on its efficacy in healthcare.

Overall, it is considered one of the safest and healthiest beverages to consume. However, there are still a few things to keep in mind when drinking green tea. There are several side effects, although many of them are rare. Most of these side effects affect individuals who are sensitive to caffeine or tannins. The majority of tea drinkers experience few, if any, side effects when drinking tea. For those that do experience side effects, always consume in moderation and avoid the drink if you are sensitive to caffeine. Read on to find out more about green tea, its side effects, and how to enjoy safely.

Looking for the best green teas? Check out our collection of the tastiest premium green teas right here.

About Green Tea

Green tea is made from the tea plant known as Camellia sinensis, just like other true teas such as black tea, white tea, and oolong teas. It is one of the least processed true teas. All true teas contain caffeine and green tea is no exception. It has been used for centuries as a medicinal tool in Ayurveda from India and traditional Chinese medicine to treat everything from fever to heart disease.

Green tea boasts health benefits that include accelerated weight loss, cancer prevention, and lower blood pressure. It has also been shown to prevent neurological diseases such as Alzheimer’s disease and Parkinson’s. Green tea has also been promoted as an alternative to coffee for people who are trying to reduce their caffeine intake. That’s because green tea contains an amino acid known as L-theanine, which helps to regulate blood sugar levels and slows the absorption of caffeine. This evens out the energy kick so you don’t get the jitters.

Research shows that green tea may help lower the risk of cardiovascular disease by decreasing LDL cholesterol and improving blood flow in blood vessels. These benefits are largely attributed to the anti-inflammatory properties of green tea. Long-term green tea consumption has also been associated with a lower risk of certain types of cancer including prostate cancer. Green tea helps you lose weight by accelerating fat oxidation and is a popular weight loss supplement.

Drinking green tea also helps to eliminate free radicals that may cause oxidative stress. Oxidative damage has been linked to a host of ailments from reduced insulin sensitivity that may lead to type 2 diabetes and various types of cell damage.

Chemical Makeup

The main chemical compounds in green tea are epigallocatechin gallate (EGCG), l-theanine, potassium, iron, calcium, and caffeine. The caffeine content of green tea is about 35 milligrams for every 8-ounce cup, which is considered moderate. The l-theanine present in green tea is responsible for the smooth, steady delivery of caffeine without spikes in blood sugar. Green tea contains b vitamins as well as tannins and folic acid.


Green tea leaves are plucked and heated to prevent oxidation. The dried leaves are then rolled to make standard green teas or ground to make matcha green tea. There are two main varieties of green tea characterized by their production either in China or Japan. Chinese green tea leaves are roasted during the drying stage of the production process. This results in green teas that are toasty and woodsy in flavor. Japanese green teas are steamed during the drying process. Japanese green teas tend to be more vegetal, floral, and sweet than their Chinese counterparts. Both types of green tea are often used as a base in herbal teas.

Green Tea Side Effects

While drinking tea is considered mostly safe for adults, there are a few side effects to keep in mind. Most of the side effects of green tea consumption can be avoided by consuming only moderate amounts. Many of these side effects only occur when consumed in massive amounts—something most tea drinkers don’t do. For most people, it would be a challenge to consume the amount of green tea required to trigger these side effects. However, certain individuals with sensitivities to ingredients in green tea should also avoid this beverage. The main compound in green tea that causes reactions in sensitive individuals is caffeine. It’s important to recognize that most of these side effects can be attributed to the mild amount of caffeine in green tea. In general, if you drink a cup of coffee without these symptoms, you’re unlikely to experience negative side effects from drinking green tea.

1. Stomach Problems

Green tea may cause stomach irritation when brewed too strongly or consumed on an empty stomach (1). Green tea contains tannins that can increase the amount of acid in your stomach. Excess acid can lead to digestive issues including constipation, acid reflux, and nausea. Brewing green tea with water that is too hot can exacerbate these side effects. Brew your green tea with water between 160 and 180 F.

Green tea can also cause diarrhea when consumed in large amounts. Caffeine produces a laxative effect as it stimulates the colon muscles to contract and release more frequently. This results in more frequent trips to the bathroom and can cause upset stomach. If you suffer from irritable bowel syndrome, avoid green tea.

To avoid these side effects, do not drink green tea on an empty stomach. Instead, consume green tea after each meal. If you suffer from acid reflux disease, stomach ulcers, avoid green tea since it can increase acidity.

2. Headaches

Green tea can cause headaches in certain individuals since it contains caffeine (2). People who suffer from migraines can consume green tea occasionally. However, you should avoid drinking green tea every day if you suffer from daily headaches. If you have caffeine sensitivity, avoid drinking green tea.

3. Problems Sleeping

Green tea contains a compound that is antithetical to sleep: caffeine. Green tea contains only small amounts of caffeine, but may still cause problems sleeping for people sensitive to caffeine. This is due to the fact that chemical compounds in green tea prevent the release of hormones such as melatonin, which aid in sleep.

Green tea also contains l-theanine, a chemical that helps to induce calm, but also increases alertness and focus—something that may disrupt sleep for some individuals. Some research shows that l-theanine is beneficial for sleep; however, these studies have mainly been conducted on individuals with disorders including ADHD and schizophrenia (3)(4). Additional research shows that l-theanine may aid sleep by lowering heart rate through the inhibition of glutamate receptors in the brain (5).

These benefits may be outweighed by the presence of caffeine in green tea—particularly in matcha green tea. While research shows l-theanine is beneficial for sleep, there is no agreed upon dosage for it’s effectiveness in the medical community. While most people may benefit from a cup of green tea before bed, people with caffeine sensitivity should consume it no later than 5 hours before bed.

4. Anemia and Iron Deficiency

Green tea contains antioxidants that hinder the iron absorption in the human body. A meta-analysis showed that this side effect can be a particularly dangerous for people who suffer from anemia or other disease where iron deficiency is present (6). One case study found that green tea caused anemia in a 48 year old businessman who consumed 1500 milliliters (6 cups) of green tea every weekday for years (7). To avoid this side effect, add lemon to your tea. The vitamin C in lemon promotes iron absorption, counteracting this side effect. Alternatively, you can consume gren tea one hour before or after a meal. This gives your body time to absorb iron without the inhibition caused by tannins. As a precaution, avoid green tea if you have anemia.

5. Vomiting

Excessive amounts of green tea can lead to nausea and vomiting. That’s because green tea contains tannins that have been linked to nausea and constipation because of the way proteins bind in the intestines (8). Avoid consuming more than 4 cups of green tea each day if you are a seasoned tea drinker. If you’re just starting out with green tea, start with 1 or 2 cups per day and monitor your reaction. Only increase consumption if you experience no side effects.

6. Dizziness and Convulsions

The caffeine in green tea can cause you to feel dizzy or lightheaded when consumed in large amounts. Caffeine decreases blood flow to the brain and central nervous system, resulting in motion sickness. In rare cases, consumption of green tea can lead to convulsions or confusion (9). In some cases, green tea consumption can also increase tinnitus, known as ringing in the ears. If you suffer from tinnitus, avoid drinking green tea. Always drink green tea in moderate amounts and avoid if you are sensitive to caffeine. Research shows that the maximum tolerated dose in humans is equivalent to 24 cups of the beverage (10). As mentioned, most of these side effects are rare and occur only when consumed in excessive amounts or in individuals senstiive togreen tea ingredients.

7. Bleeding Disorders

In rare cases, green tea can trigger bleeding disorders (11). Compounds in green tea decrease levels of fibrinogen, a protein that helps clot blood. Green tea also prevents the oxidation of fatty acids, which can lead to thinner blood consistency. If you suffer from a blood clotting disorder, avoid drinking green tea.

8. Liver Disease

Green tea supplements and high consumption of green tea can lead to liver damage and disease (12). Experts believe this is due to a build-up of caffeine that can stress the liver. To avoid this side effect, avoid consuming more than 4 to 5 cups of green tea every day.

9. Irregular Heartbeat and Blood Pressure

Green tea intake can increase high blood pressure, making it a dangerous beverage if you suffer from heart disease. This side effect is rare and more research is needed to examine the exact compounds behind the blood pressure increase. While research shows that drinking tea can help lower blood pressure, some studies have shown that green tea actually elevates blood pressure. One study found that green tea raised blood pressure more than caffeine alone (13). Another study found that drinkin ggreen tea may interefere with certain blood pressure medications including Corgard (14). If you suffer from heart disease, seek medical advice from your healthcare professional before consuming green tea.

10. Bone Health

Excess consumption of green tea increases the risk of bone disease such as osteoporosis in sensitive individuals. Compounds in green tea inhibit the absorption of calcium, resulting in a deterioration of bone health (15). Limit your intake to 2 to 3 cups of green tea if you are predisposed to bone disease. If you consume more than that, make sure to take a calcium supplement to support bone health.

11. Risks for Pregnancy and Child Use

Tannins, caffeine, and tea catechins have all been linked to increased risks during pregnancy. Experts say that green tea in small amounts — no more than 2 cups per day — is safe during pregnancy and breastfeeding. Caffeine is passed through breast milk to infants so monitor your intake in coordination with your physician. Drinking more than 2 cups per day can lead to miscarriage and birth defects in children. Make sure to keep your caffeine intake below 200 milligrams per day.

Is Green Tea Safe?

While there are several side effects to watch out for, green tea is considered safe by the FDA when used in moderation. Most of these negative side effects are due to the caffeine content and only occur when the beverage is consumed in large amounts. Stick to suggested amounts and avoid green tea if you are sensitive to caffeine. If you suffer from any illnesses that predispose you to side effects, consult with your physician before drinking green tea.

Aside from that, drink green tea or take a green tea extract in moderation to reap the healthy benefits of this plant. You can choose to steep loose leaf tea or opt for the convenience of tea bags.









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Green Tea

Green tea, one of the healthiest beverages we can drink, has been associated with about a 30 percent reduction in breast cancer risk, and may protect against gynecological malignancies, such as ovarian cancer and endometrial cancer, as well as lower our cholesterol, blood pressure, blood sugar, and body fat. It may also protect the brain from both cognitive decline and stroke. As well, tea consumption has been associated with decreased risk of diabetes, tooth loss, and up to half the risk of dying from pneumonia.

Caffeine found in coffee and tea may also help prevent and perhaps even help treat Parkinson’s, one of our most crippling neurodegenerative conditions. In a randomized controlled trial, giving Parkinson’s patients the caffeine equivalent of two cups of coffee a day (or approximately four cups of black tea or eight cups of green tea) significantly improved movement symptoms within three weeks.

Those who suffer from seasonal allergies may also benefit from drinking tea. Randomized trials have shown that drinking about three cups of Japanese Benifuuki green tea per day starting six to ten weeks before pollen season significantly reduces allergy symptoms.

Might green tea play a role in mood? The levels of an important class of neurotransmitters called monoamines, which includes serotonin and dopamine, are controlled by an enzyme called monoamine oxidase (known as MAO) that breaks down any excess monoamines. People who are depressed appear to have elevated levels of this enzyme in their brains. Thus, the theory goes, depression is caused by abnormally low levels of monoamine neurotransmitters due to elevated levels of the neurotransmitter-munching enzyme. It appears that many plant foods, including green tea, as well as apples, berries, grapes, and onions, contain phytonutrients that seem to naturally inhibit the MAO.

Phytonutrients exclusive to the tea plant appear so powerful that they may reverse disease even when merely applied to the skin. For example, the topical application of green tea in ointment form on genital warts reportedly resulted in an astounding 100 percent clearance in more than half the patients tested. It’s no wonder that this wonder treatment is now officially incorporated into the Centers for Disease Control STD Treatment Guidelines. There was even a remarkable case report of a woman whose skin cancers were apparently stopped with topical green tea application. Indeed, green tea has been shown to have positive effects on both the inside and outside of our body.

Image Credit: Gwen the Monster / Flickr. This image has been modified.

What are the health benefits of green tea?

Share on PinterestGreen tea is becoming increasingly popular in the U.S.

Listed below are the possible health benefits associated with green tea. Green tea was used in traditional Chinese and Indian medicine to control bleeding and heal wounds, aid digestion, improve heart and mental health, and regulate body temperature.

Recent studies have shown green tea can potentially have positive effects on everything from weight loss to liver disorders, type 2 diabetes, and Alzheimer’s disease.

It is important to note that more evidence is required before these possible health benefit links are proved definitive:

1) Green tea and cancer prevention

According to the National Cancer Institute, the polyphenols in tea have been shown to decrease tumor growth in laboratory and animal studies and may protect against damage caused by ultraviolet UVB radiation.

In countries where green tea consumption is high, cancer rates tend to be lower, but it is impossible to know for sure whether it is the green tea that prevents cancer in these particular populations or other lifestyle factors.

Some studies have also shown the positive impacts of green tea on the following types of cancer:

  • breast
  • bladder
  • ovarian
  • colorectal (bowel)
  • esophageal (throat)
  • lung
  • prostate
  • skin
  • stomach

Researchers believe that it is the high level of polyphenols in tea that helps kill cancerous cells and stop them from growing. However, the exact mechanisms by which tea interacts with cancerous cells is unknown.

However, other studies have not found that tea can reduce cancer risk. The amount of tea required for cancer-preventive effects also varies widely in studies – from 2-10 cups per day.

In 2005, the Food and Drug Administration (FDA) stated, “there is no credible evidence to support qualified health claims for green tea consumption and a reduced risk of gastric, lung, colon/rectal, esophageal, pancreatic, ovarian, and combined cancers.”

2) Green tea heart benefits

A 2006 study published in the Journal of the American Medical Association concluded that green tea consumption is associated with reduced mortality due to all causes, including cardiovascular disease.

The study followed over 40,000 Japanese participants between the ages of 40 and 79 for 11 years, starting in 1994.

The participants who drank at least 5 cups of green tea per day had a significantly lower risk of dying (especially from cardiovascular disease) than those who drank less than one cup of tea per day.

3) Green tea and lower cholesterol

An analysis of published studies in 2011 found that consuming green tea, either as a beverage or in capsule form, was linked to significant but modest reductions in total and LDL or “bad” cholesterol.

4) Stroke risk and green tea

Drinking green tea or coffee on a regular basis is associated with a reduced risk of stroke, according to a study published in the journal Stroke: Journal of the American Heart Association.

The lead author of the study, Dr. Yoshihiro Kokubo, Ph.D., said, “This is the first large-scale study to examine the combined effects of both green tea and coffee on stroke risks. You may make a small but positive lifestyle change to help lower the risk of stroke by adding daily green tea to your diet.”

5) Green tea for type 2 diabetes

Studies concerning the relationship between green tea and diabetes have been inconsistent. Some have shown a lower risk of developing type 2 diabetes for green tea drinkers than for those who consumed no tea, while other studies have found no association between tea consumption and diabetes at all.

6) Green tea and weight loss

Green tea may promote a small, non-significant weight loss in overweight and obese adults; however, since weight loss in the studies was so minimal, it is unlikely that green tea is clinically important for weight loss.

7) Green tea and inflammatory skin diseases

A 2007 study concluded that green tea could hold promise as a new treatment for skin disorders such as psoriasis and dandruff. Researchers studied an animal model for inflammatory skin diseases, often characterized by patches of dry, red, flaky skin caused by the inflammation and overproduction of skin cells. Those treated with green tea showed slower growth of skin cells and the presence of a gene that regulates the cells’ life cycles.

8) Working memory and the effects of green tea

Research published in the journal Psychopharmacology suggests that green tea can enhance our brain’s cognitive functions, particularly the working memory.

The research team said their findings suggest that green tea could be promising in the treatment of cognitive impairments associated with neuropsychiatric disorders, such as dementia.

9) Green tea and Alzheimer’s

In a study published in 2011, researchers tested the effect of a component of green tea, CAGTE (or “colon available” green tea extract), after it had been digested, to see how it affected a key protein in Alzheimer’s disease.

The Alzheimer’s Society commented that “this study adds to previous research that suggests green tea might help to reduce the risk of Alzheimer’s disease. However, the researchers used a far higher dose of the active green tea chemical than would ever be found in the human body. More research is needed to see whether green tea is protective at a much lower dose, and to understand the mechanism involved.”

Other studies have found that green tea might be helpful in preventing dental cavities, stress, chronic fatigue, treating skin conditions, and improving arthritis by reducing inflammation.

Further research is needed to firm up these theories.

There’s no denying that coffee is the most popular beverage to enjoy first thing in the morning, but it’s hard to ignore that more and more people have been making the switch to green tea to get their daily fix of caffeine. Regardless of when or how it’s enjoyed, there are a few health benefits that give green tea a supercharged edge over many other hot beverages (including other types of tea).

To understand why, we first have to look at where certain teas come from. All varieties of tea are first brewed from the dried leaves of the Camellia Sinesis bush and can be divided into four different categories based on how oxidized they are. White tea is made from unoxidized buds, whereas oolong tea stems from particularly oxidized leaves, and black tea is made when completely oxidized leaves are steeped in hot water. Green tea, on the other hand, is made with unoxidized tea leaves — all of these varieties contain antioxidants, chiefly flavonoids, a group of plant-based chemicals that have been shown to reduce coronary inflammation. How you choose to brew your tea — and the kind of tea you’ve chosen to brew — can play a role in its final antioxidant counts. Green tea, however, has been shown to naturally contain the highest amount of flavonoids of the four varieties, according to a 2005 scholarly review published in the Journal of Food Composition and Analysis.

But some of the hype around this herbal superstar of a daily pick-me-up has led to confusion about its immediate health benefits. Here, we’re confirming all the reasons why you should be drinking green tea — and debunking the most common myths about green tea’s best attributes.

Fact: Green tea can help you lose weight.

If you’re a regular soda, juice, energy-drink, or sweetened-coffee-and-tea drinker and you switch to unsweetened green tea, you could see some results in the long run. That’s because the number one source of added sugar (and therefore, added calories) in the American diet is from sugar-sweetened beverages, so opting for a calorie-free alternative is always best. But if you’re already sipping on water flavored with fresh fruit, sparkling water, unsweetened coffee and tea, or the occasional diet beverage, then chances are you’ll have to do more than simply switch up your hydration habits to lose weight for the long-term. Bummer, we know!

Fact: Compounds in green tea may reduce risk of cancers.

The antioxidant-compounds found in green tea have certainly been touted with cancer-fighting properties — and current research supports this in full. A pair of studies conducted in 2002 discovered that polyphenols found in green tea may suppress certain tumor cells across the body; more recently, a 2018 review of published research over the last decade found that those who regularly consumed green tea marginally lowered their risk of developing breast cancer.

There’s a catch, though. Plant-based diets are often always linked to a reduced risk of cancer — plus other chronic diseases, such as heart disease and diabetes. Among the myriad of benefits associated with packing on the veggies (and drinking unsweetened tea), plants are chock-full of polyphenolic compounds, a type of antioxidant that reduces the risk of chronic disease by improving cellular function of tissues, leaving less “room” for cancer cells to develop. So if you’re not a green tea lover, never fear! Simply loading up on veggie- and fruit-based meals and snacks — even if you choose to enjoy coffee daily — can help to reduce chronic disease risk when consumed consistently.

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Fact: Green tea may reduce heart disease risk.

In population studies, people who frequently drink unsweetened green tea are less likely to develop cardiovascular disease later in life; this 2013 review published in the American Journal of Clinical Nutrition tied the benefit to tea’s flavonoids. That said, many of these population studies are specific to region and genetics. For example: Studies conducted in Taiwan and Japan, where green tea is consumed regularly and consistently, may have a genetic predisposition to the positive effects of green tea. Regardless, population studies conducted in the U.S. and abroad consistently link drinking unsweetened versions of any type of tea as an alternative to sugary beverages with improved heart-health and reduced risk of developing other types of chronic diseases — especially ones related to obesity — so keep on chugging.

Fact: Green tea can help lower blood sugar.

If you’re drinking unsweetened versions of green tea it’s certainly a blood sugar-lowering beverage. But lately, I’m seeing green tea as an ingredient used in everything from sugary juices, “tonics” and “elixirs” to frozen yogurt, pasta sauce, and dressings, which can be loaded with sugar. Be sure to scan the nutrients label on any packaged products to ensure you’re not accidentally guzzling tons of added sugars every day.

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Fact: Green tea is different from matcha.

Think of matcha as being in the green tea “family” that undergoes a slightly different farming process, and is consumed in its powder-form (instead of whole-leaf form) which makes it a more concentrated version (and therefore, a higher caffeine/theanine version!) than green tea. We’re big fans of matcha and huge advocates for making it easier to drink unsweetened beverages on the go.

Fact: Green tea is caffeine-free.

It’s not always true, but some versions are. Many people who find coffee-drinking to be a bit too much of a jolt may tolerate the lower caffeine content of tea much better (one cup of home-brewed coffee is about 100mg of caffeine; tea is between 25-50mg, depending on the type and brew’s strength). If you’re tea-totaling before you hit the hay, look for versions that are clearly labeled “caffeine-free” on the front of the pack, or check Nutrition Facts labels closely for 0mg caffeine per serving.

All of that being said: The USDA Dietary Guidelines for Americans suggest caffeinating at around 300-400mg per day from coffee and tea to reduce risk of cognitive decline, boost memory, and improve energy — so for those who aren’t as sensitive to the jolt, don’t be afraid to drink up.

Fact: Green tea can be calming.

It may depend on your definition of “calm.” Green tea is a source of the amino acid of the amino acid L-theanine, a compound that’s linked to alertness and mood-enhancement. Research has also linked l-theanine consumption to reduced anxiety and improved focus — but if you’re drinking caffeine-containing green tea (and you’re sensitive to caffeine), you may not find guzzling the green stuff to be all that soothing. This one’s highly based on personal tolerance, so if you know you’re easily ruffled by caffeine of your favorite beverages, you may want to avoid the caffeinated varieties of all tea and coffee beverages in the afternoon through bedtime.

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Myth: Green tea boosts metabolism.

While a few small-scale studies have linked an increased metabolic rate to drinking green tea (when sipping about four caffeinated cups per day), the only truly variable factor in your basal metabolic rate (BMR) is increasing your lean body mass, a.k.a. building muscle. That’s why strength training is key to keeping your metabolism up for the long-term, and crucial to bone, muscle, and immune function, which ultimately helps to support metabolism over time. The only real, tried-and-true way drinking green tea will help boost your metabolism? By helping you wake up to get your tush to the gym.

Myth: Green tea is anti-aging.

Green tea’s antioxidants also do their “dirty work” by scavenging for free-radicals in the cells of your body, protecting and preventing damage to tissues (like skin!). But just as no single food or beverage can cure cancer, so too can green tea not behave like Botox in a bottle. According to the experts in the Good Housekeeping Institute’s Health, Beauty and Environmental Labs: “Green tea catechins may help protect skin from UV damage, but more research needs to be done with longer studies to show the benefits of topically applying green tea extract.”

Myth: Drinking green tea burns belly fat immediately.

Any time you change your diet to start a new plan in which you burn more energy than you consume, you’ll likely “burn” off some additional fat mass (for many of us, that’s stored around the tummy area, so you may notice a little tightening-up!). That said, not one single food or drink can “spot train” any body parts! Keep in mind that green tea beverages (like sugary lattes, sparkling green teas with added sugar, and green tea “flavored” drinks) are often still sugary beverages, which has been linked to weight gain over time (specifically, abdominal fat), so just make sure that you’re choosing versions with zero grams of sugar and zero calories per serving.

Jaclyn London, MS, RD, CDN, Good Housekeeping Institute Director, Nutrition Lab A registered dietitian with a Bachelor of Arts degree from Northwestern University and a Master of Science degree in Clinical Nutrition from New York University, Jaclyn “Jackie” London handles all of Good Housekeeping’s nutrition-related content, testing, and evaluation. Zee Krstic Associate Health Editor Zee Krstic is a health editor for, where he covers the latest in health and nutrition news, decodes diet and fitness trends, and reviews the best products in the wellness aisle.

How Much Green Tea Should You Drink Per Day?

The caffeine and catechins in green tea are well known for their health benefits, but they can also cause side effects for some people, especially in large doses.

Effects of Caffeine

Consuming too much caffeine can increase feelings of anxiety, interfere with sleep and cause stomach upset and headaches in some people (27, 28, 29, 30, 31).

Consuming large amounts of caffeine while pregnant may even increase the risk of birth defects and miscarriage (32).

Based on current research, everyone, including pregnant women, should not consume more than 300 mg of caffeine daily (33).

However, one review looked at over 400 studies and found that healthy adults who consumed up to 400 mg of caffeine per day did not experience adverse effects (34).

The amount of caffeine in one cup of green tea varies depending on the amount of tea used and the length of time the leaves steep.

One study found that the caffeine content of 1 gram of green tea ranged from 11–20 mg (12).

A single serving is usually measured at 1 tablespoon (2 grams) of tea leaves per 1 cup (240 ml) of water. Assuming each cup of tea is approximately 1 cup (240 ml), this means the average cup of green tea contains about 22–40 mg of caffeine.

Catechins May Reduce Iron Absorption

The catechins in green tea may reduce your ability to absorb iron from foods (35).

In fact, consuming catechins in large quantities may lead to iron deficiency anemia (36).

While regularly drinking green tea isn’t a concern for most healthy individuals, those at risk of iron deficiency should consider drinking tea in between meals and waiting at least one hour after eating before drinking tea (37).

Infants, young children, women who are pregnant or menstruating and individuals who have internal bleeding or are undergoing dialysis are all at an increased risk of iron deficiency.

The catechins in green tea can also interfere with certain medications and decrease their effectiveness.

For example, studies indicate that green tea may inhibit the effectiveness of certain heart and blood pressure medications (12).

Drinking green tea may also decrease the effects of certain medications used to treat anxiety and depression (38, 39).

Toxic effects are most common when people take green tea supplements, which have a much higher concentration of catechins than green tea itself (40).

Summary: When consumed in moderation, green tea is safe for most people. You may want to limit or avoid it if you have iron deficiency or are pregnant, nursing or taking medications for anxiety disorders or heart conditions.

Green Tea Side Effects
Drinkers Should Be Aware Of

There are green tea side effects and disadvantages that new drinkers should be aware of. Before you begin a tea diet, read this guide to avoid nasty surprises.

When I first started this site, I decided to investigate the side effects of drinking tea. I promise myself that I wouldn’t make any recommendation without first understanding the risks.

I felt quite stupid at first. After all, even the United States FDA categories tea as “Generally Recognized as Safe”. It is the second most consumed beverage after water. What can possibly go wrong?

Now seven years into publishing this article, the results surprise me. Yes, readers have been telling all the things that can go wrong from drinking green tea. It does matter what you drink and when you drink it. The results are truly astonishing!

First of all, there are the well understood side effects, such as stomach upset, caffeine sensitivity and teeth staining, which I will explain below.

There are also the allergic reactions, which ranges from the minor to the truly horrific. I have never heard of them from my own customers. I am unsure whether it is allergy or simply the tea they are drinking being contaminated with lead and pesticides.

I will go through this below shortly.

I have to confess I am not in anyway medically qualified. I tried my best to inform. If you are in doubt, please speak to your medical adviser or post a question at the Tea Side Effects Forum below.

Green Tea Side Effects Alert #1:
When you have too much caffeine.

Tea contains about half the amount of caffeine found in coffee, so moderate consumption of green tea is unlikely to cause problems for the majority of people.

However, beware if you are drinking green tea powder or matcha! Not only it is easy to overdose, these products could also contain higher concentration of caffeine.

If you are sensitive to caffeine, here are the symptoms to watch out for:

  • restlessness
  • irritability
  • sleeping problems
  • tremor
  • heart palpitations
  • loss of appetite
  • upset stomach
  • nausea
  • frequent urination
  • skin rash

How to deal with tea caffeine? It is like an onion, surrounded by layers of myths. Are you ready to peel and see what is truly inside?

Tea Caffeine – How To Minimize Side Effects

Green Tea Side Effects Alert #2:
When you have a sensitive stomach or is prone to diarrhea.

This is very common. Stomach upset is the second most common complaint after caffeine.

If you are prone to irritable bowel syndrome (IBS) or frequent diarrhea, then you probably shouldn’t be drinking green tea. It is likely to further upset your stomach.

Drinking green tea at the wrong time, such as with a meal or first thing in the morning can also cause nausea.

A 1984 study concluded that “tea is a potent stimulant of gastric acid, and this can be reduced by adding milk and sugar.” Click on the link below to discover the ten tips of enjoying a soothing cup of tea without experiencing stomach upset.

Tea and Stomach Gastric Irritation – Indigestion and Heart Burn

Green Tea Side Effects Alert #3:
When you are pregnant or are breastfeeding.

Green tea contains caffeine, catechins and tannic acids. All three substances have been linked to pregnancy risks.

Moderate consumption should be okay, but one should consider avoiding drinking green tea altogether during early pregnancy, as drinking large amount of tea (I mean tens of cups a day) may cause neural tube birth defect in babies.

Green Tea When Pregnant

Green Tea Side Effects Alert #4:
When you suffer from, or is susceptible to, iron deficiency anemia.

Tea is a “negative calories” beverage. Not only does it contain virtually no calories, it also block the absorption of certain nutrients.

While this is great if you are drinking green tea to lose weight, it can cause concerns if you are blood deficient. A 2001 study reports that green tea extract reduces the absorption of non-heme iron by 25%.

However, another 2005 study found that long-term drinkers develop protective mechanism by having heavier parotic glands. The protein rich saliva neutralizes the harmful effect of tea tannin.

Tea, Iron Absorption and Anemia

Green Tea Side Effects Alert #5:
When you experience PMS.

This is a hard one to call as the evidence is mixed.

A 2005 study found that green tea reduces the level of estrogens in the body. It is not clear if this aggravates hot flashes. If hot flashes is a concern to you, please exercise caution with drinking any tea beverage.

However, a 2003 study suggests that green tea, when taken with other herbs, may alleviate post menopausal symptoms.

Tea and Hot Flashes

Green Tea Side Effects Alert #6:
When you have young children.

If you have young kids, it is advisable for them not to drink tea. This is because tea contains caffeine that may over-stimulate. It also contains tannins that may block nutrients absorption of protein and fats in children.

Can Children Drink Tea Safely?

For older children, it is advisable for them to avoid energy drinks such as Enviga.

According to my friend Dr. Shen, energy drinks contain chemicals such as phosphoric acid, Ace-k and potassium benzoate. They are especially bad for kids, and even adults. Potential side effects include weak bones, bad teeth, cancers and allergies.

Green Tea Energy Drinks Dangers!

Green Tea Side Effects Alert #7:
When you suffer from or are susceptible to thiamine deficiency.

In the same way that tea blocks the absorption of fat, protein and iron, tea also reduces the absorption of thiamine (Vitamin B).

Thiamine deficiency leads to a condition known as beriberi. Once common to sailors, beriberi is now relatively rare in the Western world except for in alcoholics.

Green Tea Side Effects Alert #8:
When you have too many green tea extract tablets.

This is a real risk.

Some people prefer consuming green tea tablets rather than brewing hot tea. That is fine, but it is dangerous to overdose.

One study found that green tea is good for you only when used in moderation. While it has been found to prevent heart disease and cancer, it could cause liver and kidney damage when consumed in very large quantities.

“People shouldn’t be too alarmed by this, but those taking supplements may experience problems,” says lead author Chung Yang of Rutgers, the State University of New Jersey.

How many tablets can you safely consume? There is no clear cut answer, but some guidelines do exist.

Green Tea Supplement Side Effects – Harmful Extract Pills?

Green Tea Side Effects Alert #9:
When you drink low quality green tea bags and matcha.

Drinking too much low quality tea can be dangerous. It may contain contaminants such as lead (from road traffic pollution), pesticides and fluoride. The latter can be a concern if you are already drinking water that is rich in fluoride.

Low quality tea products are made from tea plants grown in low altitude or at roadside exposed to lots of car fumes. The tea farms are harvested frequently, which means pesticides have to be used. In addition, mature leaves are plucked, rather than baby tea buds. This means the tea will contain more fluoride that is accumulated from the environment.

Low quality tea leaves are usually used to make flavored tea products in the form of tea bags, matcha and iced tea, as on their own these leaves usually taste awful.

A 2005 study raised concerns about instant iced tea. A middle aged woman was diagnosed with skeletal fluorosis for drinking up to 2 gallons of iced tea daily. Why? Because her green tea contained too much fluoride.

University of Derby also reported on a study that found that economy tea bags from supermarket brands can contain dangerous concentration fluoride, making UK people susceptible to fluorosis.

Laura Chan, who carried out the study for her PhD at the University of Derby, said: “The tea plant, Camellia sinensis, is a fluoride accumulator, with mature leaves accumulating most of the fluoride.”

“When tea is harvested, these older leaves may be used to produce lower quality, stronger teas such as economy teas, whereas the bud and newer top leaves are used in the manufacture of higher grade and speciality tea products.”

Fluoride in Green Tea – Danger in Lipton Instant Iced Tea!

Want to know which food and beverage contain too much fluoride? The USDA database, which contains the fluoride content of more than 400 food and beverages, may be just what you need.

Tea and Fluoride – What Does USDA Say?

Green Tea Side Effects Alert #10:
When you have or are prone to forming kidney stones.

Kidney stones are mineral deposits made up of calcium, uric acid or the amino acid cysteine. At least three quarters of kidney stones are composed of calcium combined with phosphate or oxalic acid. Tea is a concern because it is rich in oxalic acid.

However, contrary to expectations, recent studies suggest that while black tea contains oxalic acid, green tea actually contains very little oxalic acid. In addition, green tea inhibits urinary stone formation and prevents kidney stones!

This is may not be a side effect, it is a health benefit.

Tea and Kidney Stones

Green Tea Side Effects Alert #11:
When you are allergic to tea.

Existing studies have found that drinking green tea may prevent allergy, but it also contains caffeine and tannin that may cause allergy.

Tea and Allergy Reactions – Benefits and Risks

In addition, many readers are telling that drinking tea can give rise to number of allergic reactions:

  • Skin rash and itchy skin
  • Hives and welts
  • Sore tongue

I am unsure what causes these horrible reactions. Some readers reported that the problems disappear when they switched over from cheap tea obtained from dollar shop to higher quality tea. For others, it doesn’t make any difference.

Green Tea Allergy – Hives, Welts, Itch, Sore Tongue

Green Tea Side Effects Alert #12:
When you are suffering from cough or blocked nose

If you are healthy and are drinking green tea to help boost your immunity, you are probably doing the right thing. Scientific studies have found tea to protect you against virus and bacteria.

However, if you are already suffering from cough and blocked nose, drinking tea would probably make thing worse.

In Traditional Chinese Medicine, green tea is considered cooling and damp. My experience is that drinking green tea stimulates mucous and phlegm production. It makes you want to cough or it could make your blocked nose worse.

Green Tea and Cough

Green Tea and Nasal Congestion

Green Tea Side Effects Alert #13:
Beware of slimming and weight loss teas.

There are many kinds of Chinese slimming and weight loss teas. While green tea is considered safe for long term consumption, slimming and weight loss teas that contain stimulant laxative herbs such as senna leaf and rhubarb root are especially dangerous when consumed in large quantity.

The FDA is on red alert. There have been 4 case reports of young women who died, of which herbal diet tea may be a contributing factor.

Herbal Laxative Tea – Diet Slimming and Constipation Relief?

For an in depth review of tea weight loss properties, visit Weight Loss Tea – How To Be A Successful Loser.

Green Tea Side Effects Alert #14:
When you don’t brush your teeth effectively

Drinking tea or coffee stains or discolors the dental plaque, but not the teeth itself.

If the plaque is not completely brushed and flossed away within 24 hours, it begins to harden and becomes what is commonly known as tartar. This tartar is porous and further absorbs stains from other food products.

When a dentist clean your teeth, they remove the tartar and plaque. When the tartar and plaque go away, so do the teeth stains.

Want to find out what’s the best ways to prevent teeth stains? Read Tea Staining and Teeth – 5 Whitening and Removal Tips.

Green Tea Side Effects Alert #15:
When you eat lots of tea leaves

The healthiest way to enjoy tea is to brew and drink the liquor. When you drink tea, you are protecting yourself from harmful insoluble solids that may be present in the leaves (such as synthetic pesticide DDT).

Matcha green tea sellers claim that when you consume tea powder, you are maximizing its health benefits. This is garbage. Drinking green tea is the safest and most proven way of ingesting green tea antioxidants.

Safe To Eat Tea Leaves from Tea Bag?

Green Tea Side Effects Alert #16:
When you are on medication or have a medical history.

This is perhaps the most important side effect of which to be aware.

Green tea, like any other tea beverages, can interfere and interact with certain medications. It is wise to avoid drinking any tea beverages 2 hours after taking medications.

Tea and Medical Interaction

Green tea contains caffeine. Caffeine can increase heart rate and blood pressure, although people who consume caffeine regularly don’t seem to experience these effects in the long-term.

Caffeine can also increase blood sugar levels. Diabetes patients should drink it cautiously.

The same applies to those with psychological disorders, especially anxiety or panic disorders, and overactive thyroid or hyperthyroidism.

Take care if you have severe liver disease, as the level of caffeine in the blood may build up and last longer.

Finally, if you have any other health concerns, play it safe. Consult with your health adviser before drinking green tea!

New! Comments: Like This Story? Leave A Comment!

Also In This Section…

Seven Habits To Minimise Side Effects

How to reap the maximum health benefits of your soothing cup of tea while minimizing its nasty surprises.

Drinking Too Much Tea

Take any healthy food excessively, it is likely to turn into a poison.

Potential Serious Side Effects

There are few case reports documenting serious side effects of tea. Here are worse case scenarios for the truly cautious.

Oolong Tea Side Effects

Like any other tea beverages. They key is to avoid the low quality teas.

7 Things To Avoid When Drinking Tea

What Chinese Medicine says about the art of tea drinking.

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Submitting a tip or story is easy! Just fill out the form below and hit the submit button.
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What Other Tea Lovers Say

Click on the links below.

Green Tea Give Me Unusual Dreams
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Drinking Tea Make My Teeth Feel Fuzzy
I love hot tea. But I can’t seem to find a tea that does not make my teeth feel coated or fuzzy. Has anyone else had the problem and did you solve the …

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Avoid Drinking Green Tea and Codeine
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Green Tea Has No Side Effects!
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Green Tea Side Effects – Are You Kidding?
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Decaffeinated Green Tea Side Effects
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Decaffeinated Green Tea May Cause Shingles!
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Matcha Tea and Caffeine – A Horror Story
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Green Tea Reduce Height?
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Green Tea Mixed with Coffee – Safety and Side Effects?
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Green Tea, Hypothyroidism and Synthroid
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Green Tea and Cough
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Green Tea Worsen Stomach Pain, IBS and Diarrhea
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Green Tea Cause Gout and Head Aches?
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Green Tea and Heart Rate
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Green Tea and Nasal Congestion
I drink a couple of glasses of green tea every evening. By the time I go to bed my nose is stuffed tight. I began to wonder if the tea was causing it. …

Green Tea Cause Aching?
I started aching all over and the only thing I have been doing different was I just started drinking green tea. When I quit it went away. I was drinking …

Hot Tea and Cancer
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Green Tea Fat Burner and Heart Palpitations
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Iron-Free Green Tea – Do They Exist? (Thalasemia Trait Minor)
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Green Tea for Kids
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Black Tea Irritate My Heart and Ears…
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Green Tea Allergy – Hives, Welts, Rash, Sore Tongue
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Green Tea Cause Back Pain?
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Green Tea and Breast Cancer – Cause or Cure?
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Eating Tea Leaves – Is it Safe or Healthy?
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Green Tea and Thyroid Medications
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8 Green Tea Side Effects You Need to Know About

Going green is in, whether in fashion, lifestyle or even food choices. Everywhere you go, you see that green tea has become widely available in the country. So much so that even the roadside tapri has understood the size of the clientele for it and serves it up just like you like it. It has virtually become an option for all those who want to enjoy a guilt-free dose of tea whenever they want. We have heard of the umpteen health benefits, including aiding digestion, boosting metabolism and improving heart health. And we all believe it, since we all want to work towards better health. So, we switched to healthier options in several ways, including drinking green tea. But we need to rethink our consumption—having green tea can have side effects too! The humble green tea is now known to have certain side effects that you need to be aware of. Yes, most of these can occur only if your consumption crosses a certain amount every day, under that you should be okay. Yes, you can also question yourself time and again that how can green tea be bad? How? How? HOW? But you have to accept that it is not bad, it just has some side effects. Read on and find out, before you get to the next steaming cuppa.
1. Does Green Tea Increases Caffeine levels2. Does Green Tea Reduces Absorption Of Iron3. Does Green Tea Can Lead To Stomach Ailments4. Does Green Tea Can Cause Headaches5. Does Green Tea Might Cause Sleeplessness6. Does Green Tea Causes Dehydration7. Does Green Tea Can Cause Nausea, Vomiting, And Diarrhea8. Does Green Tea May Lead To Skin Allergies9. FAQs: Green Tea Side Effects

1. Does Green Tea Increases Caffeine levels

What side effects can the caffeine is present in green tea have on your body?

You know that even though green tea originates from the same plant as black tea and underdoes much lesser processing, it still is a tea! It retains a lot more benefits as compared to black tea in terms of the levels of antioxidants, but it also contains caffeine. One may argue that the amount of caffeine in green tea is lower than the amount in coffee, but here that is not the question. We have to accept that caffeine has side effects. It can be worse for those who are intolerant towards caffeine, as even a small amount can lead to allergic symptoms.
The amount of caffeine in green tea varies a lot with the different types and brands of green tea. Since we tend to drink a few cups of green tea in the day, the intake of caffeine can increase and lead to health problems including headache, nervousness, abnormal heart rhythm, shakiness, sleeping disorders, irritability, anxiety, and heartburn. You should know it can cause lack of sleep and cause your sleep cycle to go haywire.
A high amount of caffeine in the system can also lead to issues with calcium absorption in the body. This means that even if you are eating calcium-rich foods, you will not derive the optimum benefits from it, so it could affect your bones and teeth.
Tip: Brew your tea at half strength or discard the first infusion and consume the second if you want to lower the caffeine levels in your body. Alternatively, use a small number of tea leaves to brew a larger quantity of tea.

2. Does Green Tea Reduces Absorption Of Iron

Can green tea cause an iron deficiency?

Research has shown that consuming a high amount of green tea can affect iron absorption in the body. This is due to the tannins present in the tea. It reduces the levels of iron in the body leading to deficiencies. It means that even if you are eating all the foods which are high in iron, it is not getting absorbed by your body, and therefore you not getting inappropriate benefits of the foods. Also, if you have your green tea immediately after a meal, some compounds in the tea will fuse with the iron. It will not only reduce iron absorption but also make the green tea lose its potential as an antioxidant. The way out could also be to squeeze some lemon in your tea to reduce this condition since vitamin C is known is improve the absorption of iron from food into the body. Also, increase your iron intake if you want to continue enjoying your steaming cup of green tea.
Tip: Add some citric acid to your food to improve iron absorption.

3. Does Green Tea Can Lead To Stomach Ailments

Can green tea lead to acidity?

The caffeine and tannins present in the green tea can also cause another side effect—that of an upset stomach. The caffeine and tannins tend to increase the levels of acids in the body and can interfere with the digestive process. In that case, it can cause a burning sensation, pain, constipation, and even lead to nausea. Those who are suffering from peptic ulcers, hyperacidity, or acid reflux should avoid drinking green tea completely. Research has shown that tea is a stimulant of gastric acid.
Tip: It’s best not to consume green tea on an empty stomach and try drinking it with milk for reducing the acidic effects.

4. Does Green Tea Can Cause Headaches

Do these headaches lead to dizziness?

This symptom too is related to the caffeine present in the green tea and studies have shown that it can cause varying degrees of headaches—from mild to severe. These headaches can be further aggravated due to an iron deficiency, which again we have seen can be a side effect of excessive consumption of green tea. Apart from headaches, over intake of green tea has also been known to cause dizziness among heavy drinkers. Green tea can also cause one to feel jittery and shaky.

Tip: Try decaffeinated green tea to avoid headaches.

5. Does Green Tea Might Cause Sleeplessness

Can green tea lead to insomnia?

A possible side effect of green tea is your sleeping patterns going awry, causing sleepless nights and even insomnia. It could be possible that drinking green tea quite late in the night can also cause sleeplessness. No prizes for guessing which ingredient is the culprit here, you’re right, it is attributed to caffeine. This ingredient is a stimulant and having it late in the day can have the nervous system be wide awake and energetic when actually it is time to sleep. In fact, if lactating mothers consume green tea later in the day, it can cause sleep deprivation in the infant. Insomnia can also cause mood swings and inconsistencies in mental states.
Tip: Avoid drinking green tea in the latter part of the day, especially late at night.

6. Does Green Tea Causes Dehydration

How can green tea lead to loss of water?

Yes, even though your body is receiving large amounts of water through all the tea you are drinking, unfortunately, since tea is a natural diuretic, it also causes you to frequent the restroom, and in effect losing the water from the body. Experts say that drinking excessive amounts of green tea can lead to frequent urination, which in turn leads to dehydration and causes electrolyte imbalances. Dehydration can also cause headaches, lethargy, and alter the heart rate.
Tip: Follow up every cup of tea you drink with a glass of water. Be sure you add in something to provide you with electrolytes as well.

7. Does Green Tea Can Cause Nausea, Vomiting, And Diarrhea

Can green tea cause digestive distress?

According to a study, green tea components can cause digestive distress. Also, caffeine can trigger nausea and vomiting. Try and avoid consuming over four cups of green tea on a daily basis even if you are a regular drinker. In case you have just started having green tea and are liking it, better to restrict yourself to a cup or two in a day and monitor that it does not cause any side effects.
A mild side effect could be a runny motion if you are new to green tea. It can subside once you get used to it. With excessive amounts, however, one can face loose motions and diarrhoea. This can also lead to gastric problems.
Tip: Try and have your tea in the afternoon to avoid digestive distress.

8. Does Green Tea May Lead To Skin Allergies

How can the consumption of green tea lead to rashes?

When you drink a large amount of green tea, it can lead to skin allergies such as eczema and hives. Hives are skin swellings that are extremely itchy, red and bumpy. They can form in a matter of minutes, but take some time to heal. Eczema is a condition of the skin where the skin is hypersensitive. Some people can also experience a tingling sensation on the face, lips, tongue, or in the throat. In a few cases, the skin can react sensitively and the region can get red and swollen within no time, leading to terrible itching. It can get inflamed with blisters, bumps, or boils. Extreme reactions could include flakiness, scaling, peeling or fluid discharge.
Tip: Avoid drinking strongly steeped tea to avoid skin rashes.
Check this video to learn more about Green Tea Side Effects:

FAQs: Green Tea Side Effects

Q. How much quantity of green tea is considered safe to consume?

A. Most experts believe that three to four cups a day could be ideal if they are had at an appropriate time. It is best to avoid drinking green tea on an empty stomach, immediately after a meal or late in the night. If you feel like consuming more tea during the day, experts suggest you dilute the tea and have it so that the same quantity of green tea can be brewed into more cups for you.

Q. Can any sweetener be added to green tea?

A. Yes, you can add sweeteners for taste. You just need to realise that too many sweeteners have their own side effects, and so you need to limit the quantities. If you suffer from diabetes, you need to reconsider your usage of sweeteners in any case. Green tea can be had with sugar, honey and artificial sweeteners. You can also add natural ingredients like ginger, lemon and lemongrass to your green tea.

Q. What is decaffeinated green tea and will it help?

A. Decaffeinated green tea is one where the caffeine component is removed through processing. There are two kinds of decaffeination processes. In the manual process, the concentration of catechins in the tea is drastically reduced, so the benefits will automatically go down. The second is a natural process, where the green tea leaves are soaked in water to take out the caffeine component and processed to replenish the lost nutrients. Even in the second one, the processing can lead to more harmful elements being added to the tea. So consume it, but not in large amounts.

Q. Can I have cold green tea?

A. Yes, you can, as long as you brew your tea properly and then cool it either over ice or in the refrigerator. In fact, cold green tea might retain a little lesser amount of caffeine, which could be good.

Q. Can you drink green tea if you are on regular medication?

A. It is advisable that you restrict your consumption of green tea if you are taking regular medication since it is known to have untoward reactions with certain medicines, including antibiotics, which can cause ill effects. Green tea can also not be used when taking blood thinners.
Green tea can also interfere with the absorption of certain medications. This can lessen or intensify the effects of the drugs, putting your health at risk. It’s best to ask your treating doctor for advice and follow it.

Q. What precautions should I follow while drinking green tea?

A. There are a few pointers you can follow: Try not to exceed three or four cups a day. Also, avoid reusing the teabags. If you want it to last for more cups, brew a large quantity of tea at the same time with more water instead of reusing the bag. As mentioned earlier, don’t drink it on an empty stomach or late at night. The best time to drink it would be in between meals, but not right after a meal. Drink adequate water and also eat iron and calcium-rich foods.
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