It is not recommended to talk about acidity and alkalinity; there is no authoritative literature on food acidity and alkalinity. Some of the so-called expositions of food acidity and alkalinity refer to food ash, which is the oxides of some elements left after the burning of food, which is quite different from the nature of the metabolites of food after it has been digested, absorbed and utilized in the body. Lemonade, i.e. lemon boiled or infused water, can provide some nutrients needed by the body after drinking. Lemon is rich in vitamin C, but also contains carbohydrates, crude fiber, potassium, calcium, magnesium, iron, zinc, vitamin P, vitamin B and other nutrients. There is a limited amount of nutrients dissolved in the water after infusion. Lemon water in moderation is beneficial to the human body, but not too much to eat, so as not to cause nausea, vomiting and other discomforts.