Postmenopausal women are at high risk of osteoporosis. Prevention stra
tegies should aim at reducing postmenopausal loss of bone mass and opt
imizing skeletal mass in young women. Osteoporotic fracture risk is in
fluenced by genetics, estrogen status and physical activity. Nutrition
al factors of importance are those affecting the calcium balance. Prev
entive measures include adequate dietary calcium intake. Calcium balan
ce depends also an urinary calcium loss and intestinal calcium absorpt
ion rate. Because the latter is influenced by the vitamin D status, at
tention must be paid on adequate vitamin D supply, particularly in the
elderly. Another factor of consideration is body weight. An enhanced
body mass index is associated with reduced risk of osteoporosis. Under
weight should be avoided.