Children in their growth and development stages experience changes in their voices due to hormonal fluctuations in their bodies. To help teenagers smoothly transition through the entire voice-changing period, it is essential to maintain a regular lifestyle, ensure daily necessary nutrition and adequate sleep, and avoid irritating substances such as tobacco, alcohol, and chili peppers, as well as upper respiratory tract infections. Among these, adequate nutrition, particularly protein, B vitamins, and calcium, is crucial for the development and repair of the laryngeal cartilage and vocal cord membranes. Therefore, adolescents going through the voice-changing period should consume more meat, eggs, dairy products, and fresh vegetables and fruits. They should avoid spicy and fried foods, and refrain from smoking and drinking alcohol.

Furthermore, children in their voice-changing period should not consume too many preserved fruits. The reason is that many preserved fruits, such as sour plums and olives, are irritating foods, and excessive consumption hinders the resolution of vocal cord congestion and edema. Moreover, they are high-sugar foods that create an acidic environment locally, significantly weakening the phagocytic function of white blood cells and increasing the risk of various infections in the throat. Chronic inflammation can lead to abnormal development of the larynx and vocal cords. Secondly, excessive sugar intake can cause the entire body's blood to become more acidic, leading to the depletion of elements like calcium and magnesium and the accumulation of metabolites such as pyruvic acid and lactic acid. Calcium is involved in the formation of the laryngeal cartilage rings; a calcium deficiency can result in incomplete development of a child's laryngeal cartilage, which not only affects pronunciation but can also cause breathing difficulties. An increase in metabolites like pyruvic acid and lactic acid can increase the vascular endothelial permeability of the larynx and vocal cords, causing plasma components to leak into the interstitial space. This makes the already congested and edematous laryngeal and vocal cord tissue even "thicker," leading to articulation disorders.

During the production of preserved fruits, licorice is sometimes used as a seasoning or mixed in. Modern medical research has shown that licorice has an adrenocorticotropic hormone-like effect. While moderate, short-term use can reduce local inflammatory reactions and alleviate vocal cord congestion and edema, long-term and excessive intake of licorice will lead to the side effects of its adrenocorticotropic hormone components. First, hormones promote protein breakdown while inhibiting its synthesis. Long-term use can lead to insufficient synthesis of elastin in the larynx and vocal cords, weakening the larynx's support for the vocal cords and reducing the vocal cords' own resilience. Secondly, hormones promote water and sodium retention. Long-term use can decrease urine output and sodium excretion, causing the body to retain excessive sodium and salt, which can lead to hypertension and edema. Thirdly, long-term hormone use can weaken the body's immune function, reducing the number of monocytes that reach the site of inflammation and impairing the macrophages' ability to fix, phagocytose, and kill antigens. Antibody formation can also be suppressed. Therefore, frequent consumption of preserved fruits made with licorice can also decrease the local resistance of the throat, leading to infections. When inflammation spreads to the vocal cords during the acute phase, it causes congestion, edema, and increased secretions. Chronic and repeated inflammatory stimulation can lead to thickening of the vocal cords, the formation of vocal nodules, and a further deepening and hoarseness of the voice.