A study published in the American Journal of Clinical Nutrition suggests that milk drinkers are more likely to lose weight than those who skip drinking milk when on a diet. In a two-year study, researchers observed 300 overweight or at-risk men and women ages 40 to 65 years. The participants were put on low-fat, Mediterranean or low-carbohydrate diets for two years, but regardless of diet, those that consumed 580 mg of milk per day (about two glasses), lost about 12 pounds, compared with those with the lowest dairy calcium intake (averaging about 150 mg, or about half of a glass), in which participants lost just seven pounds.
Researchers also found that vitamin D levels independently affected weight loss success, and, in line with previous research, milk and milk products were the top contributors to vitamin D in the diets of the study participants.