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Women who are taking birth control pills have lower
bone mineral density (BMD) than women who have never
used oral contraceptives.
Past studies in postmenopausal women have found that supplementation
with the hormones estrogen and progestin actually helps maintain
bone density. But few have looked at the effect of hormones on premenopausal
women.
After adjusting for age, body mass index and height, BMD in oral
contraceptive users was 2.3% to 3.7% lower
than in women who had never used oral contraceptives, especially
in the spine and the upper part of the thigh bone.
Canadian Medical Association
Journal October 16, 2001;165:1023-1029
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