Vitamin A is an indispensable trace element for the human body. If it is deficient, it will affect the eyes, skin, growth and development, autoimmunity and absorption of trace elements, as follows:
1. Eye performance: susceptible to night blindness, poor vision in the dark light, which is the result of vitamin A-induced retinopathy.
2. Skin manifestations: easy to appear dry skin, peeling, itching, epithelial keratinization hyperplasia, reduced sweating and so on.
3. Growth and development: As vitamin A promotes growth and development, skeletal system development, if deficient, it can easily lead to growth retardation, and even affect the development of the spine, skull and other nervous system.
4. Vitamin A has the role of enhancing immunity, if the lack of easily infected, especially digestive and respiratory tract infections.
5. Lack of vitamin A easily leads to the absorption of calcium and other trace elements. Therefore, vitamin deficiency can easily lead to a relative shortage of other trace elements.