Onions have a certain weight loss effect, but should be combined with other dietary control and reasonable exercise, in order to play a better weight loss effect. Onion is a common vegetable, tender flesh, juicy, spicy taste is light, can be eaten raw, can be fried, can play a role in weight loss, mainly because of its almost no fat, and is a low-calorie, high-fiber vegetables. Consumption during weight loss can increase satiety and reduce the intake of other high-calorie foods. Onions also contain glutathione, stilbene and other components, which have a strong antioxidant effect, can improve liver function and promote fat metabolism. Onions have a large amount of vitamin C and minerals, vitamin C can promote human digestion and absorption. In addition, the skin of the onion is also rich in polyphenols, has a very high antioxidant power, this material is absorbed by the body can be faster fat, has a certain weight loss effect.