3. Keep portions in check
Whatever you’re eating, watch the portion sizes: enjoy one scoop of ice cream, not five. Over time, you can gain weight even by eating healthy foods if you take in too much. “A serving is one fist. A medium-size apple is bigger than a fist, so it’s two servings,” says Dr. Lau. “The smaller the person, the smaller the fist, the smaller the portion.” Dr. Lau doesn’t usually prescribe counting calories to his patients, but he notes that the individuals who are most successful at maintaining their weight keep a food diary.