Low Vitamin D Levels Linked to Weight Gain in Older Women

TUESDAY, June 26 (HealthDay News) —
Older women with low levels of vitamin D, also known as the “sunshine
vitamin,” may be more likely to gain weight, a new study indicates.

Researchers from the Kaiser Permanente Center for Health Research in
Portland, Ore., said their findings are significant since most women aged
65 and older do not have enough vitamin D in their blood.

The researchers followed more than 4,600 women aged 65 and older over
the course of nearly five years. The study found the women with low levels
of vitamin D gained about two more pounds during that time than those with
normal levels of the vitamin.

Although most of the women in the study were not trying to lose weight,
over the course of the study 27 percent of the women lost more than 5
percent of their body weight and 12 percent gained more than 5 percent of
their body weight, the researchers noted.

Low levels of vitamin D were found in 78 percent of the women. These
women generally weighed several pounds more to begin with, the researchers
noted. In the group of women that did gain weight, those with insufficient
vitamin D levels gained 18.5 pounds over five years. In comparison, the
women with normal vitamin D levels gained 16.4 pounds during that time
frame.

“This is one of the first studies to show that women with low levels of
vitamin D gain more weight, and although it was only two pounds, over time
that can add up,” study author Dr. Erin LeBlanc, an endocrinologist and
researcher at the Kaiser Permanente Center for Health Research in Oregon,
said in a Kaiser Permanente news release.

“Nearly 80 percent of women in our study had insufficient levels of
vitamin D,” LeBlanc said. “A primary source of this important vitamin is
sunlight, and as modern societies move indoors, continuous vitamin D
insufficiency may be contributing to chronic weight gain.”

The study authors pointed out that previous research found that older
women may need higher doses of vitamin D to keep their bones strong and
prevent fractures, although there is not enough evidence to support
vitamin D supplements among younger people. They noted, however, that
other experts say many adults require these supplements to improve their
bone health.

“Our study only shows an association between insufficient levels of
vitamin D and weight gain,” LeBlanc said. “We would need to do more
studies before recommending the supplements to keep people from gaining
weight. Since there are so many conflicting recommendations about taking
vitamin D for any reason, it’s best if patients get advice from their own
health care provider.”

The study, funded by the U.S. National Institutes of Health, was
published online June 25 in the Journal of Women’s Health.

More information

The U.S. National Institutes of Health Office of Dietary Supplements
provides more information on vitamin D.

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