Vitamin A Intake and Hip Fractures Among Postmenopausal Women
Abstract
CONTEXT: Ingestion of toxic amounts of vitamin A affects bone remodeling and can have adverse skeletal effects in animals. The possibility has been raised that long-term high vitamin A intake could contribute to fracture risk in humans. OBJECTIVE: To assess the relationship between high vitamin A intake from foods and supplements and risk of hip fracture among postmenopausal women. DESIGN: Prospective analysis begun in 1980 with 18 years of follow-up within the Nurses' Health Study. SETTING: General community of registered nurses within 11 US states. PARTICIPANTS: A total of 72 337 postmenopausal women aged 34 to 77 years. MAIN OUTCOME MEASURES: Incident hip fractures resulting from low or moderate trauma, analyzed by quintiles of vitamin A intake and by use of multivitamins and vitamin A supplements, assessed at baseline and updated during follow-up. RESULTS: From 1980 to 1998, 603 incident hip fractures resulting from low or moderate trauma were identified. After controlling for confounding factors, women in the highest quintile of total vitamin A intake (>/=3000 microgram/d of retinol equivalents [RE]) had a significantly elevated relative risk (RR) of hip fracture (RR, 1.48; 95% confidence interval [CI], 1.05-2.07; P for trend =.003) compared with women in the lowest quintile of intake (/=2000 microgram/d vs /=6300 microgram/d vs /=1000 microgram/d vs <400 microgram/d). CONCLUSIONS: Long-term intake of a diet high in retinol may promote the development of osteoporotic…
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