A recent study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM) found that consumption of dairy foods and higher protein resulted in improvements in markers of bone formation and reductions in markers of bone degradation in overweight and obese young women over 16 weeks of diet- and exercise-induced weight loss.
Previous studies have shown that higher body weight is associated with greater bone mass and that weight loss through dieting can adversely affect bone health. While the individual effects of dairy, calcium, protein and exercise on bone during weight loss have been studied in premenopausal women, no trial until now has combined all these strategies together into one study to support bone health.
"Our findings show that a diet with a high proportion of dairy foods and higher than recommended protein intake was associated with improved markers for bone health," said Stuart Phillips, PhD, of McMaster University in Hamilton, Ontario and senior author of the study. "Thus, to avoid deleterious consequences to their bone health, women who are attempting weight loss through dieting should practice consumption of more protein from dairy sources."
In this study, researchers conducted a controlled randomized weight loss intervention trial involving 90 premenopausal overweight or obese women which was designed to achieve weight loss and be supportive of bone health. Phillips and his colleagues employed modest dietary calorie restriction and daily exercise including aerobic and resistance training with varied intakes of protein and dairy foods. Researchers used dual-energy X-ray absorptiometry (DXA) scans to assess bone mineral density and content, and analyzed participants' urine and blood samples to evaluate serum levels of several bone health biomarkers.