Lemon black tea is a common drink that does not have the benefits or contraindications of drugs. Drinking it in moderation can provide the body with carbohydrates and other nutrients. Each 100 grams of lemon can provide 35 calories, containing 6.2 grams of carbohydrates, 1.1 grams of protein, 1.2 grams of fat, 1.3 grams of dietary fiber, 22 milligrams of vitamin C, 101 milligrams of calcium. Black tea provides 324 calories per 100 grams and contains 59.2 grams of carbohydrates, 26.7 grams of protein, 1.1 grams of fat, 378 milligrams of calcium, and 28.1 milligrams of iron. Lemon black tea can make lemon and black tea in part of the nutrients dissolved in water, moderate intake, help the body to supplement all kinds of nutrients, while increasing water intake, is conducive to good health. However, lemon black tea is not a drug, will not produce the efficacy of drugs, and no drug side effects. In addition, because of its strong acidity and the caffeine in black tea tends to aggravate gastrointestinal discomfort in patients with gastric disorders, so patients with acute gastritis, gastric ulcers, gastroesophageal reflux patients should appropriately limit their intake. At the same time, black tea contains more caffeine, a large amount of intake can easily lead to insomnia. It is recommended to consume lemon black tea in moderation.