Wednesday, March 18, 2009

Vitamin D: Sunlight Can Be Good for You


Evidence is growing that Vitamin D is crucial to many aspects of health—and that deficiency is extremely common, even in seemingly healthy people. The vitamin’s best-known role is in building bone, but low levels also appear to be associated with diabetes, heart disease, and infertility, among other diseases. “When you start looking at the data, the health benefits of D appear to be at every cellular level, in multiple organs,” said Lubna Pal, M.B.B.S., director of the Reproductive Aging and Bone Health Program.

Pal and her colleagues studied the health records of over 400 healthy pre-menopausal women and found that an astonishing 79% of them had low vitamin D levels. She found a link between low vitamin D levels and abnormal levels of blood sugar, insulin, inflammatory markers, and body mass. Such markers are associated with a higher risk of cardiovascular disease and diabetes. Women who were not Caucasian had lower levels of vitamin D, while more physically active women had higher levels.

In a previous study, Pal checked levels of vitamin D in the ovaries of 84 women undergoing fertility treatments. Almost two-thirds of the women had low levels, and those who achieved pregnancy had, on the average, higher levels of vitamin D than those who didn’t.

Vitamin D is made by the skin when touched by sunlight; it is also found in some foods. “We’re becoming more under-the-shade workers [and are] not getting our daily allowance,” said Pal. She suggests spending 10 minutes in the sun each day.

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