Catechins and EGCG, Green Tea's Star Compounds
Unlike black tea, which undergoes full oxidation, green tea is briefly processed so its catechin antioxidants remain intact. These compounds are the stars behind green tea's reputation as a healthy drink.
Beyond catechins — especially epigallocatechin gallate (EGCG) — green tea contains polyphenols, caffeine, L-theanine, vitamins C and E, and fluoride. Research published in the journal Beverages in 2017 found these substances deliver benefits such as preventing cancer, reducing inflammation, fighting bacteria, and protecting the heart.
Protecting the Heart and Managing Weight
Green tea's catechin antioxidants help lower LDL cholesterol and maintain blood vessel elasticity, reducing cardiovascular disease risk. Drinking 1–2 cups of green tea a day helps keep the heart in good shape.
Green tea is also popular among dieters. Its caffeine and EGCG work synergistically to raise metabolism and help the body burn fat and calories more efficiently. Naturally, results are best when paired with a balanced diet and exercise.
Sharper Focus and Cell Protection
Green tea contains a moderate amount of caffeine — enough to improve alertness and concentration, but generally without the jitters coffee can trigger. Its amino acid L-theanine adds relaxation while sharpening focus.
Its antioxidants protect body cells from free-radical damage that drives premature aging and chronic disease. For skin, antioxidant-rich green tea also helps maintain moisture and reduce signs of aging.
Don't Overdo It: Know the Risks and Safe Limits
Healthy as it is, green tea should not be consumed in excess. Its tannic acid can raise stomach acid production and irritate digestion, while its polyphenols can bind minerals such as iron, magnesium, and calcium, reducing their absorption. Its caffeine can also disturb sleep if drunk in the afternoon or evening.
The general guidance: brew one teaspoon (about 2 grams) per glass and enjoy 1–2 cups daily on a regular basis. If you have a history of ulcers, hypertension, or are pregnant, check with your doctor about a safe amount. It is also best not to drink green tea together with iron supplements or certain medications so absorption is not impaired.
