Tonsils generally begin to atrophy at the age of 10-13 years, i.e. gradually after the onset of puberty. The tonsils are an important organ of the human body, located in the human mouth, one on each side, in the triangular space between the two sides of the oropharynx, the palatoglossal and palatopharyngeal arches, and are the largest lymphoid tissue in the pharynx. The tonsils have an immune function and are immunologically active organs that protect the upper respiratory tract and the entire organism from invasion by germs. Under normal circumstances, as children gradually grow and develop, the exposure to allergens gradually increases, and the tonsils gradually increase in size, especially at the age of 6-7 years, which is a physiological enlargement. After adolescence, the tonsils will gradually atrophy physiologically because the immune function of the tonsils gradually decreases. For adolescents with shrinking tonsils, the diet should be light, easy to digest and rich in nutrients, as well as pay attention to rinsing the mouth with light salt water in the morning and evening to ensure the cleanliness of the mouth and avoid tonsil infection and inflammation. In addition, excessive fatigue, exposure to cold, and local physical or chemical factors can also easily lead to tonsillitis, which should be avoided.