Drinking water with lemon in moderation can replenish water, vitamins and other nutrients for the body, provide energy and help maintain the physiological functions of the body. Lemon is a common fruit with certain nutritional value. Lemon contains 91% water, 1.1% protein, 1.2% fat, 6.2% carbohydrates, 22mg vitamin C, 209mg potassium, 101mg calcium and other ingredients, about 100g lemon can provide 169KJ energy. Therefore, drinking lemon water in moderation can be beneficial to the body by replenishing the nutrients it contains, providing energy and helping to maintain the normal physiological functions of the body. However, if one is allergic to lemons, it is not recommended to drink lemon water to avoid food allergic reactions such as itchy skin, abdominal pain and rashes.