Adding milk to your diet can contribute to weight loss in the presence of controlled calorie intake. Skim, low fat, chocolate, and whole milk contains whey protein which has been shown to decrease adiposity by breaking down fat more efficiently. The whole milk version may provide more satiety and the lower fat versions contain fewer calories and fat while providing the same nutrients. The whey protein may also contribute to maintenance of lean muscle mass. However, the addition of milk alone does not foster weight loss.