Green tea contains nutrients and antioxidants that provide many health benefits – from preventing cancer to improving brain function. Read this article to learn all about this nutritional drink.
What is Green Tea?
Green tea contains polyphenols and catechins, which are micronutrients found naturally in our foods that can act as antioxidants.
Epigallocatechin gallate (EGCG) is the main polyphenol found in green tea and is known to have many beneficial effects on human health. The polyphenols can reduce the formation of free radicals, which play a role in diseases. This protects cells and molecules from damage. There are also minerals found in green tea that are important for health .
L-theanine is also found in green tea, and it is especially good for the brain.
Because there are no known health risks associated with green tea and no toxic level, green tea is a great way to help you become a healthier person .
- Antioxidants found in green tea can help prevent cancer
- EGCG promotes brain health and defends against Parkinson’s and Alzheimer’s Disease
- EGCG protects the heart
- It protects against inflammation
- Drinking green tea can help you lose weight
- The caffeine found in green tea can lead to anxiety, heart rate problems, etc. if you drink too much
- It might lower testosterone levels
Health Benefits of Green Tea
1) Antioxidants Found in Green Tea Can Lower Your Cancer Risk
Oxidative damage is known to cause various cancers in the body, so the many antioxidants found in green tea help lower your risk .
The polyphenols found in green tea prevents cancer from growing by regulating cancer cell growth, survival, and metastasis. It affects the cancer cells at the DNA, RNA, and protein levels .
2) Promotes Brain Health
The EGCG, caffeine, and L-theanine all work to improve brain function and health.
EGCG and L-theanine both increase memory and attention in patients with mild brain damage .
L-theanine also has anti-anxiety effects and can help you calm down .
Green tea also reduced depressive symptoms and increased reward learning .
3) Helps You Lose Weight
Green tea can help you lose weight in many ways.
It has been shown to increase your metabolism and help burn more fat .
Green tea suppresses appetite and leads to less energy consumption .
Green tea also interacts with other compounds that burn fat as well as adrenaline to increase the body’s metabolic rate .
EGCG suppresses an enzyme that breaks down norepinephrine, so this increases the amount of norepinephrine in the body. This hormone signals for more fat cells to be broken down, which can now be used as energy .
In addition to these properties, green tea can increase your endurance. The exhaust time for patients that drink green tea was extended. This means that you can exercise for a longer time and be able to lose more weight .
Consumption of green tea also decreases carbohydrate consumption as well as block fat absorption .
In a study done on overweight and obese women, green tea consumption resulted in more weight loss .
4) Reduces Heart Disease Risk
Green tea also lowers blood pressure by increasing blood flow in the body .
5) Lowers Risk of Diabetes
This then lowers blood glucose levels .
6) Fights Against Bacterial Infections
Green tea acts as an antimicrobial agent. Its properties can reduce bacteria spores in the body .
EGCG damages bacterial membrane and fights against infections 
Mouthwash with green tea in it also reduced plaque and gingivitis .
7) Has Anti-Inflammatory Effects
Polyphenols found in green tea helped prevent inflammation due to UV rays .
EGCG also prevents and treats inflammation due to rheumatoid arthritis .
8) Improves Liver Health
Polyphenols in green tea can help improve liver health. It lowers lipid levels in the body and reduces the risk of non-alcoholic fatty liver disease .
9) Helps Skin
EGCG has anti-wrinkle effects and also reduced redness in the skin .
10) Prevents Baldness
EGCG helps to prevent baldness. The polyphenols in green tea can stimulate human hair growth .
11) Promotes Dental Health
The polyphenol also helps enhance the activity of dental adhesives .
12) Prevents Osteoporosis
EGCG promotes osteoclast and osteoblast growth in bone cells. EGCG can be used in stem cell research to help prevent osteoporosis .
13) Green Tea Can Help You Live Longer
Polyphenols in green tea protect telomeres from damage. Telomere damage can affect your biological age and increase disease risk. Thus, polyphenols can help prevent aging .
EGCG could prevent telomere shortening .
Green tea increases N-acetyl aspartate , which can help with intelligence.
Green tea may lower thyroid function .
Side Effects & Precautions
Harmful effects of tea overconsumption (black or green) are due to a few main factors :
- Its caffeine content
- The presence of aluminum [42, 43]
- The inhibition of iron absorption by tea polyphenols 
- Toxicity to the liver in high dosages
If you drink too much, the caffeine found in green tea can lead to anxiety, heart rate problems, etc. L-theanine found in green tea can also cause dizziness, headaches, and digestive problems [45, 46].
In rats, green tea consumption lowered testosterone levels by 20% and sperm count by 2%. This might affect reproduction .
Higher intake of green tea might cause oxidative DNA damage of hamster pancreas and liver .
EGCG acts as a pro-oxidant, rather than an antioxidant, in pancreatic insulin-secreting cells. Therefore, a high intake of green tea may be detrimental to diabetic animals .
At a high dose (5% of the diet for 13 wk), green tea extract induced a thyroid enlargement (goiter) in normal rats . This high-level treatment altered concentrations of thyroid hormones. However, drinking even a very high dietary amount of green tea would be unlikely to cause these adverse effects in humans.
Green tea should not be taken by patients suffering from heart conditions or major cardiovascular problems. Pregnant and breastfeeding women should drink no more than one or two cups per day because caffeine can cause an increase in heart rhythm.
Caution should be taken if an individual is taking a diuretic drug (as a result of caffeine’s diuretic effects).
Some studies revealed the capacity of tea plants to accumulate high levels of aluminum [42, 43]. This aspect is important for patients with kidney failure or those with neurological diseases because aluminum can be accumulated in the brain.
Because of the rare risk of liver failure, we don’t recommend taking more than 1 capsule of the extract, or 400mg of EGCG.
Drug and Supplement Interactions
- Fish Oil and Fish: Fish oil worked together with catechins in green tea to increase fat and glucose metabolism while nutrients found in fish helped lower blood pressure .
- Ubiquinone: This supplement helps to increase the effectiveness of EGCG’s antioxidant properties .
- Curcumin: Curcumin works together with EGCG to reduce tumor progression in colon cells .
- Vitamin C: This vitamin works with green tea to reduce cancer risk .
- Capsicum vanilloids: Found in hot peppers, capsicum vanilloids help fight against cancer by increasing cell killing ability .
- Vitamin E: Coupled with Vitamin E, green tea polyphenols improved exercise capacity, lowered glucose levels, and reduced body weight .
Do not exceed 400mg of EGCG per day, as more has been associated with liver issues.
Increasing the Availability of EGCG
EGCG generally has a poor ability to get absorbed and distributed to tissues. However, there are situations and ways to enhance the availability of EGCG supplements.
Ways to increase availability:
- Piperine 
- Vitamin C 
- Fish Oil 
- Soft water 
- Do not take with calcium or magnesium supplements – or foods high in Ca and Mg 
- Take while fasting 
Buy EGCG Supplements / Jasmine Tea
Want More Targeted Ways to Enhance Brain Function and Mood?
If you’re interested in natural and targeted ways of improving your cognitive function, we recommend checking out SelfDecode’s Limitless Mind DNA Protocol. It gives genetic-based diet, lifestyle and supplement tips that can help improve your cognitive function. The recommendations are personalized based on your genes.
Also, check out SelfDecode’s Mood DNA Wellness Report. It also gives genetic-based diet, lifestyle and supplement tips that can help improve your mood.
SelfDecode is a sister company of SelfHacked. This post contains sponsored links, which means that we may receive a small percentage of profit from your purchase, while the price remains the same to you. The proceeds from your purchase support our research and work. Thank you for your support.