Watermelon is known as the "king of summer", refreshing and thirst quenching, sweet and juicy flavor, is the summer fruit, watermelon, in addition to fat and cholesterol-free, contains a large amount of glucose, malic acid, fructose, protein amino acids, lycopene and rich in vitamin C and other substances, is a rich in a very high degree of nutrition, purity, food safety food. The sugar content of flesh is generally 5-12%, including glucose, fructose and sucrose. The sweetness increases with the increase of sucrose in the late ripening stage. Watermelon Flesh: Protein, glucose, sucrose, fructose, malic acid, citrulline, glutamic acid, arginine, phosphoric acid, endocannabinoid, propionic acid, ethylene glycol, betaine, adenine, sucrose, radishin, carotene, tomato hydrocarbons, hexahydroxytomato hydrocarbons, vitamins A, B, C, and a variety of aldehydes in the volatile components. Watermelon seeds: containing fat oil, protein, vitamin B2, starch, pentosan, propionic acid, urea, sucrose and so on. Watermelon rind: watermelon rind is rich in vitamins C and E. The effects of watermelon: 1. Watermelon juice also contains a variety of important health and beauty chemicals. It contains citrulline, alanine, glutamic acid, arginine, malic acid, phosphoric acid and other amino acids with physiological activity of the skin, but also contains adenine and other important metabolic components, sugars, vitamins, minerals and other nutrients. These components of the watermelon, the most easily absorbed by the skin, the facial skin moisturizing, sunscreen, whitening effect is very good. Methods: rub the face with melon juice, or cut off the outside of the green skin of the watermelon, with the inside of the white skin thinly sliced patch for 15 minutes. 2, because of the diuretic effect of watermelon, coupled with water, so eating watermelon after urination will increase, thus reducing the content of bile pigment, and make the stools unobstructed, on the treatment of jaundice has a certain effect. In addition, the diuretic effect of watermelon can also make the salt out of the body, reduce swelling, especially swelling of the legs, for long time sitting in front of the computer and numbness and swelling of the legs of women, watermelon is a natural leg fruit.