First of all, there is a certain relationship between people's physique and nutrition, but there are many factors affecting physique, which are not entirely caused by nutrition. For example, the following are also several factors that affect people's physique. 1, human exercise needs to consume a lot of nutrients; However, eating nutrients more than consuming energy for a long time will lead to obesity, and vice versa. 2. Absorption function. Not all the food you eat can be absorbed by your body. The main place to absorb nutrients is the small intestine. If the gastrointestinal function is not good, it will also affect absorption, and even if it is ingested more, it will be excreted with feces. 3. Effects of diseases. For example, diseases such as thyroid, diabetes, adrenal gland and digestive system are easy to cause underweight. Secondly, as long as you are not particularly thin, you don't need to adjust your weight. If your physique is too thin and you want to change, you can gain weight in the following ways. People who are too thin should first check whether it is the potential influence of the disease. Such as thyroid, diabetes, adrenal gland and digestive system diseases. It is easy to cause underweight. Only when the disease is eliminated can the fattening plan be implemented. Protein should eat more foods rich in fat and carbohydrates (starch, sugar, etc.) when it has sufficient intake. In this way, excess energy can be converted into fat and stored under the skin, making the thin body strong. If the gastrointestinal function is weak, you can choose chicken, duck, fish and sheep liver to eat. In addition, fish is easy to digest and absorb, which is also very helpful for the accumulation of human fat. Therefore, I suggest that you first find out what causes your body to be thin and check whether there is a nutritional problem. If it is caused by nutrition, it can be changed by the food introduced above. If not, you can change it through the detailed introduction above. At the same time, if there is anything you don't understand, please continue to ask questions. Wish you good health.