Eating sweet potatoes to lose weight is feasible, but it is not always useful. It has two sides to lose weight. The principle of weight loss effect of sweet potato is that it contains 10 kinds of trace elements, linoleic acid and a lot of dietary fiber, which can stimulate defecation and detoxify, thus helping to lose weight. Eat sweet potatoes to lose weight, preferably in the morning. First, because the morning is the time for the body to automatically detoxify. Second, sweet potato can accelerate intestinal peristalsis, promote intestinal patency and facilitate defecation. This two-pronged approach is conducive to detoxification and weight loss, but be careful not to eat more. Why eating sweet potatoes at night is not conducive to losing weight? Because sweet potato belongs to starch food, when there is too much sugar in it, the body can't fully absorb it or it is easy to produce gas during digestion. When sleeping, undigested gas will make people feel bloating, which will hinder sleep and turn sugar into fat. At the same time, sweet potato is a coarse grain food with good nutrition, but you can't eat too much. Sweet potato contains an oxidase, which easily produces carbon dioxide gas in the gastrointestinal tract. If it is too much, it will make people burp or fart, and even make people uncomfortable. Under normal circumstances, the amount of sweet potato in a day is about 200-300 grams. It should also be noted that sweet potato can be eaten as a staple food alone. Sweet potato itself lacks protein, and lipids are not nutritious. It is best to eat with other vegetables or fruits or protein foods, such as pickles and salty soup or boiled porridge with diced sweet potatoes. You should also pay attention to some tips when choosing sweet potatoes, not to mention the freshness. Some sweet potatoes are also inedible, such as black or brown spots on the skin, small black holes on the uneven surface, musty smell (moldy sweet potatoes contain ketotoxin, which is inedible), and sprouting (sprouted sweet potatoes are not as toxic as ponytails, but have a bad taste).