Calcium and vitamin
D supplements after menopause can improve women's cholesterol profiles. And
much of that effect is tied to raising vitamin D levels, finds a new study from
the Women's Health Initiative (WHI) published in Menopause, the
journal of The North American Menopause Society (NAMS).
Whether calcium or
vitamin D can indeed improve cholesterol levels has been debated. And studies
of women taking the combination could not separate the effects of calcium from
those of vitamin D on cholesterol. But this study is helping to settle those
questions because it looked both at how a calcium and vitamin D supplement
changed cholesterol levels and how it affected blood levels of vitamin D in
postmenopausal women.
Daily, the women in
the trial took either a supplement containing 1,000 mg of calcium and 400 IU of
vitamin D3 or a placebo. The women who took the supplement were more than twice
as likely to have vitamin D levels of at least 30 ng/mL (normal according to
the Institute of Medicine) as were the women who took the placebo. Supplement
users also had low-density lipoprotein (LDL—the "bad" cholesterol)
levels that were between 4 and 5 points lower. The investigators discovered, in
addition, that among supplement users, those with higher blood levels of
vitamin D had higher levels of high-density lipoprotein (HDL—the
"good" cholesterol) and lower levels of triglycerides (although for
triglycerides to be lower, blood levels of vitamin D had to reach a threshold
of about 15 ng/mL).
Taking
the calcium and vitamin D supplements was especially helpful in raising vitamin
D levels in women who were older, women who had a low intake, and women who had
levels first measured in the winter—what you might expect. But lifestyle also made
a difference. The supplements also did more to raise vitamin D levels in women
who did not smoke and who drank less alcohol.
No comments:
Post a Comment