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Green Tea Benefits And Side Effects – Healthy or Unhealthy?

Green Tea Benefits And Side Effects - Healthy or Unhealthy? / Image by highnesser from Pixabay
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What are the benefits and side effects of Green Tea? How healthy or unhealthy is Green Tea? Let’s examine this excellent tea!

Green tea gets hyped and praised to the skies for years for its health benefits. But what are the benefits of Green Tea? Or the side effects when drinking too much of it?

Thanks to its unique ingredients, green tea is probably one of the healthiest drinks in the world. Many tea fans highly appreciate its stimulating effect. 

However, green tea scores particularly highly for its numerous health benefits. There is much more in this popular hot drink than most people suspect and expect.


Table of Contents

Benefits of Green Tea

Benefits of Green Tea
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Green Tea getting valued as one of the largest medicinal plants for almost 5,000 years. There are many written sources which prove that green tea was drunk in ancient China and Japan for a long time, initially practically exclusively for medicinal reasons. The effects and possible applications of green tea are so varied and comprehensive.


What are the benefits of Green Tea?

Whether Matcha, Sencha, or Gyokuro, Green tea is a true all-rounder. The reason for this is its ingredients and its effect. Green tea is so healthy in many ways. Let us look at the benefits of green tea.


Green tea and stress

L-theanine, an amino acid in green tea, has a psychologically balancing effect and can help to reduce stress and anxiety.


Green tea and allergies

The substance EGCG in green tea helps to attenuate allergic reactions. Regular consumption of green tea gets recommended for allergy sufferers.


Green tea can help lower cholesterol

Green tea helps lower cholesterol levels and also improves the ratio of “good” (HDL) to “bad” (LDL) cholesterol by reducing LDL levels.


Green tea against obesity

Green tea protects against obesity by limiting the absorption of glucose in fat cells.


Green tea against diabetes

Green tea helps to modulate fat and sugar metabolism, prevents a steep rise in blood sugar levels, and keeps the metabolism in balance.


Green tea and Alzheimer’s disease

Green tea helps to improve memory performance. Certainly: There is still no cure for Alzheimer’s disease. But green tea works against the reduction of acetylcholine in the brain. Acetylcholine gets believed to play a significant role in the course of the disease.


Green tea and Parkinson’s disease

The antioxidants in green tea protect against cell damage in the brain, which can trigger Parkinson’s disease in specific brain regions. Tea drinkers who already have Parkinson’s disease are less likely to have their symptoms worsen.


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Green tea protects against cancer.

Green tea supports to reduce the risk of cancer through its antioxidants. The antioxidants are about 100 times stronger than vitamin C and 25 times more durable than vitamin E. However, each antioxidant neutralizes different free radicals in various tissues, so taking vitamin C and E gets recommended.


Green tea against HIV

Japanese scientists have discovered that EGCG in green tea can prevent the HI virus from binding to healthy immune cells. Therefore, green tea can counteract the spread of the virus.


Green tea protects the heart.

Green tea helps to prevent heart disease and strokes by favorably influencing cholesterol and fat metabolism. After a heart attack, it accelerates recovery.


Green tea and anti-aging

Polyphenols, a particular class of antioxidants, can efficiently fight free radicals, thereby slowing down aging processes and promoting longevity.


Green tea and weight control

Green tea can help with weight loss. It improves the burning of fat and increases the metabolic rate (basal metabolic rate) naturally. A few cups help to burn about 70 extra calories per day, which can mean losing just a few extra pounds a year.


Green tea and healthy skin

Antioxidants in green tea protect the skin from free radicals that cause wrinkles and skin aging. Skin cancer protection is also getting discussed.


Green tea and arthritis protection

Green tea can help decrease the risk of arthritis because it protects cartilage tissue by blocking inflammatory enzymes that can attack cartilage tissue.


Green tea prevents osteoporosis.

The fluoride content in green tea helps to strengthen bones and teeth. Daily consumption can help maintain bone density.


Green tea protects the liver

Green tea increases the success rate in liver transplantation. Researchers have also shown that green tea can neutralize the free radicals that getting produced in an adipose liver.


Green tea against hypertension

Drinking green tea helps to keep blood pressure down because green tea suppresses the production of too much angiotensin, a substance that leads to high blood pressure.


Green tea against food poisoning

The catechin in green tea can eliminate bacteria that cause food poisoning and also neutralize the toxins that such bacteria produce.


Green tea and blood sugar

The polyphenols and polysaccharides in green tea help to lower blood sugar naturally.


Green tea and the immune system

Polyphenols and flavonoids from green tea improve immune functions and increase resistance to infections.


Green tea against flu-like infections

Green tea can protect you from contracting a flu-like disease — a positive synergy results in vitamin C.


Green tea and herpes

Green tea has an antiviral effect and therefore increases the effectiveness of external interferon treatment in herpes. With a compress, green tea can first be applied to the affected skin surface, and then a special herpes treatment can be carried out.


Green tea and dental health

Thanks to its antibacterial and antiviral properties, green tea fights germs that can cause gum disease. It also reduces the production of harmful acids by bacteria.



Side Effects of Green Tea

Side Effects of Green Tea
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Isn’t there a side effect of green tea, which we’ve counted so much about its benefits? 

As with all food, some side effects of green tea have been detected in case of excessive consumption. 

Experts warn that no more than 5 cups of green tea a day should be consumed. If you drink too much green tea, you may experience side effects and specific conditions.


Possible side effects of green tea

The consumption of green tea rich in caffeine can cause different symptoms. These symptoms are usually only temporary but can last for a more extended period if tea consumption is more intensive until use is stopped or reduced. 

These side effects occur to different degrees in different people, and sensitivity can change significantly over time. Some tea connoisseurs only notice the first signs after drinking a large quantity of tea, and others become restless after the first or second cup of green tea. 

Researchers have also found that women are more sensitive to caffeine than men and that caffeine gets broken down more slowly.

The following list contains the most typical symptoms:

  • Palpitations
  • Cardiac arrhythmia
  • Breast sensitivity in women
  • Feeling of dehydration 
  • Dry skin
  • Thirst
  • Nervousness
  • Irritability
  • Mild dizziness
  • Problems falling asleep
  • Skin irritations
  • Penetration
  • Stomach pain
  • Intensification of symptoms of existing diseases


What to do in case of green tea side effects?

The green tea varieties Bancha, Genmaicha, and especially Karigane / Kukicha contain less caffeine. Gyokuro, Tencha, and Matcha contain particularly high levels of caffeine. 

High-quality Sencha includes a lot of caffeine. 

Once you have found your balance, you should carefully and slowly try to reduce the quantity and quality of the teas to a regular dose. Try to consume generally healthier drinks like Sencha, Gyokuro, and Shincha.

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It is essential to drink enough fresh water when taking green tea.


Is green tea unhealthy?

As with all foods and active ingredients, green tea should be adapted to the individual’s constitution and should only be drunk in quantities that do not cause problems. 

If side effects occur, the dose should be reduced or even stopped in any case because, in some instances and with certain risks, it should not be taken at all. In case of doubt or illness, this should be discussed with a doctor.


Green tea can reduce the absorption capacity of iron.

Another meaningful connection is that green tea can reduce the absorption capacity of iron in the body. However, this does not refer to iron that is bound to meat (hemoglobin) but only to vegetable (trivalent) iron. However, this is only true if a lot of tanning gets into the tea water, and this happens, especially after a brewing time of about two minutes.


Green tea can cause dental plaque.

In contrast to black tea or coffee, regular consumption of green tea discolors the teeth only to a minimal extent, as long as they are carefully cleaned regularly with a good toothpaste. However, if you drink green tea and leave your teeth uncleaned, the plaque can harden and can form unwanted tartar.


People who should not consume green tea

Drinking daily green tea is beneficial in many ways. However, in some cases or people with certain diseases, it may be necessary to consult a doctor before consuming green tea. 

The persons and conditions that get recommended to stay away from green tea are as follows:

  • People with heart rhythm problems
  • Those with bone weakness
  • People with bleeding problems
  • People with high eye pressure and glaucoma
  • Pregnant and nursing women
  • Patients with anemia
  • Patients with high blood pressure
  • People with anxiety disorders
  • Liver, stomach ulcers and kidney patients


Drugs that should not consume together with green tea

Green tea, which interacts inversely with the drugs listed below, may cause some health problems. It’s recommended consulting your doctor before drinking green tea if you are taking any of the following medications:

  • Aspirin and blood-thinning drugs
  • Chemotherapy drugs
  • Lithium drugs
  • Birth control pills
  • Some antibiotics (such as Beta-lactam)
  • Heart rhythm regulator and heart remedies
  • Anxiety medications (such as Diazepam and lorazepam)
  • High blood pressure medications


Most Asked Questions About The Side Effects and Benefits Of Green Tea

Most Asked Questions About The Side Effects and Benefits Of Green Tea
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Is green tea harmful to health?

These powerful antioxidants are said to have a preventive effect against cancer and heart disease. Green tea can also help you lose weight, especially by melting the dangerous fat in the middle of the body and reducing the overall body fat percentage.


Is it possible to drink too much green tea?

Green tea, as well as the extract EGCG, can have a toxic effect on the liver and kidneys. To take a therapeutically effective amount of the active substance contained in green tea, you would have to drink a lot of cups of tea.


Is green tea good for the liver?

Green tea can damage the liver and intestines. Green tea reduces the risk of heart disease and cancer. The reason for this is the so-called polyphenols, which act as antioxidants and protect the liver. But if you take such substances in the form of a concentrate, too high a dosage can damage the liver.


Is green tea healthy?

It is an excellent source of antioxidants. These protect the body from cancer, are suitable for the blood vessels, and also protect against diabetes. Green tea has a different effect than coffee because its impact is milder and better tolerated.


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What is the healthiest tea?

  • Matcha
  • Bancha tea
  • Pu-Erh tea
  • Oolong
  • White tea


Is green tea good for the heart?

Green tea is good for the heart. It can prevent strokes and heart disease because it has a positive effect on metabolism.


Is green tea bad for teeth?

Green tea helps against tooth decay as it has an antibacterial effect. Individual tea polyphenols (aromatic compounds) kill the caries bacteria. Thus, green tea can help to stifle the formation of plaque in the bud. According to studies, black tea also has this effect.


Can you drink green tea every day?

Accordingly, no general answer can be given as to how much green tea one should drink every day. There are certainly tea lovers who like to drink several liters a day. Above all, low-tein varieties like Japanese Bancha tea can be drunk in more substantial quantities without hesitation.


Why not brew green tea with boiling water?

Green tea should not be brewed with boiling water. Too hot water can destroy the vitamin C in green tea, and it also tastes slightly bitter. The heat also destroys vitamin C in the drink. The warmth of the water should be around 80 degrees.


How to drink green tea properly?

Green tea preparation with the right water temperature is essential. Green tea is not prepared with boiling water, because then it becomes bitter. To make green tea, first, boil the water until its brewed and then let it cool down to 80 degrees for about 5 minutes. Now you can give your tea place into the cooled water and enjoy your drink.


Can you lose weight with green tea?

Green tea is not only particularly healthy but is also considered a slimming product. A nutritionist explains how green tea helps you lose weight. Studies show that green tea, drunk daily, protects against cell damage and premature aging.

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What effect does green tea have on the body?

Green tea has a positive outcome on blood pressure. Drinking two or three cups a day is said to lower blood pressure according to studies. The tea is said to suppress the formation of angiotensin, which is responsible for high blood pressure.


How often can green tea be brewed?

The question of whether green tea can be brewed several times keeps on occupying tea lovers. The answer is relatively simple: Yes, you can – and should – brew high-quality tea several times.


Why does green tea taste bitter?

The water temperature and brewing time are particularly important when preparing green tea. If it is brewed too long, it becomes bitter. If it is brewed too short, it hardly tastes good. If the water is too hot, the right ingredients (such as antioxidants or tanning agents) are dissolved.



Get the best health advice from your doctor about the benefits and side effects of green tea.


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