Most thin people have gastrointestinal nutrition absorption disorders. In general, underweight is related to genetic factors. At the same time, some excitable people, due to the influence of endocrine, will accelerate the consumption of calories. Some people get nervous easily, and the result may be missing a meal or losing appetite. It is natural to lose thousands of calories at a time, so you will definitely not gain weight.

If you find yourself underweight and thin, you 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.