Thin is due to eating less and malnutrition. This statement has some truth, but it is still not comprehensive. Indeed, many thin people are hungry by themselves, but there are still many thin people who eat a lot, but they don't grow meat. There is also an irregular diet. If you don't eat on time, you won't get fat.

Blood deficiency is the real cause of emaciation, and emaciation is the most obvious indication to judge a person's blood deficiency. The problem of being thin is more complicated than that of being fat. People who want to be fat have different situations. It can be roughly divided into four types: delicate type, malabsorption type, hypermetabolism type and fatigue type. ?

Thin? The body contains less fat and the muscles are not full.

Malnutrition is a term to describe health status, which is caused by improper or insufficient diet. It usually refers to malnutrition caused by insufficient intake, malabsorption or excessive nutrient loss, but it may also include overnutrition caused by overeating or excessive intake of specific nutrients. If you can't take a healthy diet composed of proper amount, variety or quality of nutrients for a long time, individuals will be malnourished. Chronic malnutrition may lead to hunger and death.

References:

Baidu encyclopedia malnutrition