The Ecology of Humans (46-4) Vitamin D


Vitamin D enhances digestive absorption of calcium, iron, magnesium, phosphate, and zinc.

Although vitamin D is obtained through foods, the main source is sunshine. The skin produces vitamin D via exposure to ultraviolet light. Hence, vitamin D is not strictly a vitamin. Nonetheless, sufficient vitamin D cannot be biosynthesized, so it must be partly obtained in the diet.

Numerous studies link vitamin D levels with overall health. In elderly people, lack of vitamin D is instrumental in accelerating decrepitude.

Few foods offer ample vitamin D. Mushrooms are high in vitamin D – somewhat odd, considering they grow in the dark. Alfalfa sprouts, fatty fish, and egg yolks also contain considerable vitamin D.