US Pharm. 2011;36(9):HS-39-HS-40. 

Women with a low dietary intake of calcium are at greater risk of fractures and osteoporosis, researchers in Sweden reported. In a large prospective cohort study, women who started with the lowest dietary calcium were 18% more likely to suffer a fracture than those with an intake of about 700 mg a day, according to Eva Warensjö, PhD, of Uppsala University in Uppsala, Sweden, and colleagues. Above that level, however, there was little additional benefit, they reported online in BMJ. The risk of a first fracture was highest in the low-intake group, the researchers found. In the four higher groups, however, there was little additional benefit, they reported.