I remember a friend with a thin body said, “Like my current body type if you want to build muscle, you have to first make yourself fat, and then fat into muscle ……” At that time, looking at his firm eyes, I was convinced of what he said. Only later did I realize that this was not “buying cloth with eyes closed” – nonsense …… Muscle and fat are like water and oil, they do not transform into each other. Fat is like a piece of clothing, wrapped in muscle above, so we usually see a person gradually obese is not the original muscle becomes fat, but fat accumulation directly form fat covered in muscle above. Similarly, obese people do sports exercise this process is mainly to consume the accumulated fat, so that the original muscle highlights, rather than fat training into muscle. Therefore, fat loss and muscle gain can be said to be two separate and independent things. Today, it is common to use exercise to lose weight, which is indeed a good option for some people who are mildly overweight. However, if people who are overweight exercise to lose weight due to excessive pressure on the body skeleton may lead to damage to the bones. Therefore, for this part of the severely obese people, it is recommended to try weight loss surgery to lose weight. Severely obese people generally have a strong nutrient absorption capacity, and one of the functions of weight loss surgery is to reduce the amount of nutrient absorption by reconstructing the digestive tract, and also reduce the stomach capacity to limit the amount of food the body can eat, so as to achieve the effect of weight loss.