Catechins contained in tea can reduce the absorption of sugar and fat. Catechin is an antioxidant of polyphenols, and the alkyl group of polyphenols will form a valence bond with the aldehyde group of carbohydrates, preventing the absorption of carbohydrates in the digestive tract; In addition, polyphenols can also combine with amino acids, inhibit the activity of digestive enzymes, and reduce the digestion and absorption of protein. If the body's excess calories are not used up, fatty acids will be synthesized in mitochondria and then stored in fat cells in the form of fat droplets. This process needs the action of fatty acid synthase, and catechin is a good fatty acid inhibitor. Therefore, drinking a lot of green tea after a big meal can reduce the synthesis of fatty acids and prevent heat from being converted into fat (note 1).

It should be noted that this method is not recommended for patients with hypertension, heart disease and kidney disease to lose weight; Because of these three types of people, drinking too much water can easily lead to hypertension, hydronephrosis, or lymphedema of the inner ear can lead to Meniere's disease (Note 2).

Note 1: Brega. The historical framework of the development of obesity concept. In: Brega, bouchard C, Dacker M, editor. Handbook of Obesity, 2nd Edition. 2004; Marcel Dekker Company, new york, USA

Note 2: A well-known Meniere's disease in otolaryngology is caused by endolymphedema in the inner ear. Patients will have dizziness, imbalance, stuffy ears, earplugs, poor hearing and other symptoms. Such patients should not eat too salty food or drink too much water before or after meals.

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