Black tea refers to fermented tea, its nutritional value is very rich. Drinking some black tea in moderation can effectively absorb the carotene, vitamins, calcium ions, magnesium ions and other nutrients in black tea, and can provide a variety of essential amino acids for the body's metabolism. Drinking some black tea in moderation can promote intestinal peristalsis, enhance appetite, and have a certain amount of water seepage dampness, heat detoxification and swelling effect. Black tea can also regulate blood sugar, reduce blood fat, for cardiovascular and cerebrovascular diseases have a certain preventive effect.