If obesity is the result of an excess of nutrients, then will weight loss lead to malnutrition? In fact, the ideal weight loss effect is to release the excess “nutrition” from the body. As we all know, when the body’s calorie intake is greater than the normal amount needed, the accumulated calories will gradually form fat in your body, the process of weight loss is the process of using these reserves of fat to the fullest. This is why the ketogenic diet and the common “hunger strike” diet have emerged. Both of these methods are designed for one purpose: to burn fat. In order to achieve this goal, many people for their own customized diet recipes, usually these recipes are single nutrient food, weight loss is not ideal and is not good for health. In fact, obesity is originally a manifestation of malnutrition. Many people have the impression that malnutrition is thin “skin and bones” state, imagine the obese diet has high fat, high calorie characteristics, in common parlance is excessive “picky”, break the balanced diet, resulting in the body part of the nutritional imbalance. Therefore, we often say that obesity is over-nutrition, the other side of this is malnutrition. Weight loss science inside the so-called “seven points by eating, three points by practice” is reasonable, many people but did not put the diet right leading to have been doing useless work, followed by weight loss failure, weight rebound, increased the difficulty of weight loss. When obesity delayed to a more serious degree, especially BMI ≥ 32 obese people, even a balanced diet is difficult to achieve the effect of weight loss. In this case, there are not many suitable weight loss methods, and many people choose weight loss surgery. Under surgical adjustment, the newly built gastric sac and reconstructed digestive tract can keep the body from eating too much food, while effectively reducing the amount of nutrients absorbed by the body in food, and the body re-establishes a new eating environment after the double change. Over time, as the body adapts to the new environment, it is able to achieve highly effective and stable weight loss after the surgery.