What is the reason for thin people?

The reason for thinness may be family inheritance, or there is no fat person in the family, so it is also a thin body type. There is also a faster metabolism, that is, the food eaten has not been absorbed by nutrients and is immediately decomposed by the body. For this group of people, you can take multiple meals a day on your daily diet, light diet, fast some spicy and greasy foods, or exercise under conditions to increase your food intake.