What are the characteristics of avitaminosis A, D, C? How to prevent vitamin deficiency?

1) Avitaminosis A leads to night blindness, peeling of the skin.
2) Avitaminosis D causes rickets in children, disorders of calcium and phosphorus metabolism.
3) Avitaminosis C leads to inflammation and bleeding of the gums (scurvy).
4) To prevent vitamin deficiencies, you need a diet that contains all the necessary vitamins.

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