After each reaction, the eye needs vitamin A to restore the retina so we can continue to see. An inadequate supply of vitamin A leads to night blindness, causing the eyes to readjust slowly and making it difficult to see in dim light or when changing from light to dark. Vitamin A is also necessary for the proper structure and function of the adrenal glands, which control our response to stress. Normal growth and development of bones during childhood and their continued strength in the adult years depend on vitamin A, too. Vitamin A, which occurs primarily in two forms, is involved in the process that converts fat into energy for our bodies.
Retinol is the form that is ready to use and is found only in foods of animal origin.
Carotene, orange plant pigments found in many fruits and vegetables, is provided by foods of plant origin. The body converts carotene into vitamin A. Sources of vitamin A are broken down into four categories. Liver, carrots, pumpkins, sweet potatoes, spinach, winter squash, turnip greens, mustard greens, and beet greens are excellent sources. It is recommended that in order to maintain optimum health you consume foods rich in vitamin A at least four times a week. The Association for Child Development is a multi-faceted, nonprofit organization.