Dieting will inevitably lead to insufficient intake of protein, resulting in negative nitrogen balance, delaying growth and development, reducing weight loss and affecting intellectual development. In severe cases, there will be malnutrition edema.

Secondly, dieting will lead to insufficient intake of various vitamins. Cereals are rich in B vitamins, especially vitamin B2, which can cause angular stomatitis and glossitis when lacking. Vegetables contain a lot of vitamin C, which will lead to scurvy when lacking; Vitamin d deficiency can cause abnormal bone metabolism, short stature or bone deformation; Vitamin A deficiency can lead to night blindness.

In addition, dieting will lead to the lack of various inorganic salts and minerals. Insufficient or improper intake of calcium and phosphorus will directly affect bone development; Iron deficiency can lead to anemia; Zinc deficiency will affect human growth and gonadal development.