Indication: Bone loss (during diets)
Am J Clin Nutr, April 2007;85(4):972-80.
Forty-four overweight, postmenopausal women were randomly assigned to a calorie-restricted diet, including either normal (1 gram per day) or high (1.8 grams per day) levels of calcium for six months, or were recruited for weight maintenance on 1 gram of calcium per day. Bone mineral density (BMD) and bone mineral content (BMC) were assessed before and after weight loss.
Researchers found the normal- and high-calcium weight-loss groups lost over 7% of initial body weight with no significant decrease in BMD or rise in bone turnover rates. Additionally, weight loss did not affect calcium absorption levels, which were deemed adequate at study's end. The study investigators concluded that overweight premenopausal women do not lose bone during weight loss at normal or high calcium intake, which may be due to sufficient amounts of absorbed calcium.