Supplement:
Grade I: pure water, mineral water. Pure water removes almost all impurities in water, which is the true nature of water and has many benefits to human body. Pure water is oxygen-rich water, which can activate cells and internal organs and enhance immunity and resistance. Mineral water mainly comes from deep underground. They are water thousands or even tens of thousands of years ago. According to the current national standard for drinking natural mineral water in China, as mineral water, it should not contain substances harmful to human body or health at first; Secondly, it must contain a certain amount of characteristic trace elements beneficial to human body, such as lithium, strontium, zinc, bromine, iodine, metasilicate, selenium, total dissolved solids and other boundary indicators, and at least one of them must meet the national mineral water standards, otherwise it cannot be called mineral water. High-quality mineral water usually has low sodium content, moderate mineral content, one or several characteristic trace elements, and good water quality and taste. Grade two: tea and coffee. Green tea, oolong tea and black tea are three kinds of teas that are often drunk. Tea can provide antioxidant substances such as tea polyphenols and some micronutrients, and has the functions of preventing and treating cancer, reducing the risk of cardiovascular diseases, increasing bone density, reducing tooth decay and dental caries and kidney calculi. Coffee has a refreshing effect.
The third grade: low-fat milk (fat content is 1.5% or 1%), skim milk and soybean beverage. It is an important source of high-quality protein, calcium and some essential micronutrients needed by human body, and yogurt also contains bacteria beneficial to human body. Grade 4: Sweet beverage without calories. It only provides moisture and sweetness, not energy. Grade 5: beverages containing certain nutrients. It refers to pure fruit and vegetable juice, whole milk (with a fat content of 3.25%), alcoholic drinks and sports drinks. Grade 6: sweet drinks with calories. This drink contains almost no other useful nutrients except high energy.