1 grade: water, whether boiled or mineral water, is the basic substance to maintain normal metabolism and physiological functions, and some essential minerals in the human body can be absorbed by the human body through drinking water. The most important thing to drink every day is this "simple" water. Grade 2: unsweetened tea and coffee tea and pure coffee contain no calories. Tea is rich in flavonoids, which not only has antioxidant effect, but also can improve vasodilation function. Proper drinking of coffee (no more than 1 cup per day) can reduce the incidence of type II diabetes. Grade III: Low-fat, skimmed milk (or sugar-free bean drinks) Milk is an important source of calcium, magnesium, potassium and vitamin D. A lot of evidence shows that drinking more milk is helpful to improve bone mineral density. Grade 4: Non-calorie sweet drinks refer to tea drinks and milk drinks. There is evidence that the increase in sweetness of drinks makes people like sweets more, thus reducing the possibility of choosing foods with low sweetness. Grade 5: sugared drinks with calories and certain nutrition refer to 100% fruit juice and vegetable juice, wine and sports drinks. It is better to eat whole fruit than to drink juice, and it is better to eat vegetables than to drink vegetable juice. In addition, the salt content of vegetable juice is also high. This grade of drinks can be drunk properly when necessary, but it is not a daily necessity. Grade 6: sweet drinks with calories. This grade of drinks includes carbonated drinks such as cola, which are widely sold in the market at present, and drinks with little juice but very high sugar content. Sweeteners used in these drinks may lead to dental caries, obesity and type II diabetes, so try to drink as little as possible. According to this six-level pyramid, generally speaking, the proportion of calorie-free drinks in daily drinks should exceed 60%; Nutritional drinks such as milk should not be replaced by drinks with low nutrition and high calorie; The intake of sugary drinks must be reduced, while the intake of low-calorie drinks should be increased.