The research, published in The American Journal of Clinical Nutrition, analyzed 28 studies from seven countries that explored the relationship between children drinking cow’s milk and the risk of being overweight or obese. None of the studies — which involved a total almost 21,000 children between the ages of one and 18 years old — showed that kids who drank reduced-fat milk had a lower risk of being overweight or obese. Eighteen of the 28 studies suggested children who drank whole milk were less likely to be overweight or obese.