Thursday, March 4, 2010

Sunlight on Vitamin D

Do you get enough vitamin D? The American Journal of Clinical Nutrition Dec. 2008 sheds daylight on this question.

One study found that vitamin D levels appear lower among Americans than 15 to 20 years ago. The decline in vitamin D levels is attributed to these factors: increasing body weight, declining milk consumption, and increasing use of sun protection.

How to get your RDA of Vitamin D?
  • Daily sun exposure of 10-15 minutes in non-peak hours may provide adequate vitamin D
  • People who use sun protection (Don't we all?) need more time in the sun or other sources of vitamin D.
  • Dietary sources of vitamin D:
  • Vitamin D supplements at currently recommended doses can increase vitamin D levels in the body. There is wide diversity (600%) in human absorption of vitamin D (mostly related to weight)

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