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Vitamin D and Your Body – Harvard

Earlier this week I wrote about Vitamin D affecting waist reduction in a study. It is complicated to work out all the factors that affect our Vitamin D level yet this is a very valuable vitamin in our arsenal of good health.

The greatest natural source of Vitamin D

The greatest natural source of Vitamin D


Harvard Healthbeat
says, “The process by which the body makes vitamin D is complex. It starts when the skin absorbs rays in the invisible ultraviolet B (UVB) part of the light spectrum. The liver and the kidneys also participate to make a form of the vitamin that the body can use.
“A number of factors influence a person’s vitamin D levels.

Here are six important ones.
1.
Where you live. The farther away from the Equator you live, the less vitamin D–producing UVB light reaches the earth’s surface during the winter. Residents of Boston, for example, make little if any of the vitamin from November through February. Short days and clothing that covers legs and arms also limit UVB exposure.

2.
Air quality. Carbon particles in the air from the burning of fossil fuels, wood, and other materials scatter and absorb UVB rays, diminishing vitamin D production. In contrast, ozone absorbs UVB radiation, so pollution-caused holes in the ozone layer could end up enhancing vitamin D levels. For those of us who life In the U.S. just being out in the sun is not sufficient to get adequate Vitamin D during the winter because of the sun’s acute angle to the earth.

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