| Both sexes lose bone mass during their lifetime but after the menopause women usually lose bone mass much faster than men. Postmenopausal women have an increased risk of bone loss for three reasons: (1) bone mineral content tends to be lower in women than in men; (2) dietary calcium intake may decrease with age, and (3) the rate of bone loss accelerates at menopause. From 1.5 years before menopause to 1.5 years after menopause, spine bone mineral density decreases by 2.5% per year, compared with a premenopausal loss rate of 0.13% per year. |