( y decreased as body fat increased. Sunl...)Lack of Sun Does Not Explain Low Vitamin D in Elderly Who are Overweight,Health

y decreased as body fat increased. Sunlight exposure could not account for low vitamin D stores in older people with high percent body fat, explains Harris.

Vitamin D is called the sunshine vitamin because it is produced by the body when the skin is exposed to ultraviolet (UV) rays from the sun. Vitamin D can also be obtained from foods such as fish and fortified milk and from supplements. When this fat-soluble vitamin enters the body it is converted in the liver to 25-hydroxyvitamin D. This is one of several important forms of vitamin D, and is the form that researchers and clinicians use as an indicator of vitamin D status in individuals. Vitamin D is especially critical in maintaining bone health, and there is evidence that many older Americans have low blood levels of vitamin D, which can put them at risk for bone fractures and osteoporosis, says Dawson-Hughes, who is also a professor at Tufts University School of Medicine.

These results cannot be carried over to other populations, such as young people, or elderly living in different climates. However, if low vitamin D stores are not attributed to low sunlight exposure in this population, it suggests that we should explore other possibilities, says Harris. The most likely explanation seems to be that vitamin D is sequestered in fat tissue, reducing its entry into the blood.


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