Regarding the acidity and alkalinity of food, there has been a one-sided argument: long-term consumption of acidic food such as meat, milk, etc. leads to tumors, obesity, heart disease, etc. It is recommended to consume alkaline food such as vegetables and fruits. Now the acidity and alkalinity of food related knowledge to do a summary: the acidity and alkalinity of food is based on the nature of the ash produced after the complete combustion of food is divided into acidic food refers to food ash dissolved in water solution is acidic food, alkaline food refers to food ash dissolved in water solution is alkaline food. Generally speaking, foods containing more minerals such as sulfur, phosphorus and chlorine are acidic foods, while foods containing more minerals such as potassium, sodium, calcium and magnesium are alkaline foods. To put it simply, most of the animal foods, except milk, are acidic; most of the plant foods, except grains, cereals and beans, are alkaline; and salt, oil, sugar, coffee, tea, etc., are neutral. But there are a few exceptions. Food in the human body digestion, absorption, metabolism after the formation of acidic, alkaline, and neutral, very complex, but the human body has a perfect buffer system and regulatory system, with the ability to self-regulate the acid-base balance of the blood acidity and alkalinity is a variety of metabolite balance of the results of relying on the acidity and alkalinity of the food can not change the acid-base balance of the human body. The Dietary Guidelines for Chinese Residents recommend a variety of foods and a balanced diet, so that people can enjoy the food while consuming sufficient and reasonable nutrition, and there is no need to estimate whether the food is “acidic” or “alkaline”.