Healthy Aging Tip on Portions vs. Servings. A portion is how much food you eat at one time. A serving is a standard measurement of the food. To maintain a healthy weight, Consider serving size—make informed choices. Don’t get caught up in portion distortion. Read labels. A Good rule of thumb. Make ½ your plate veggies, ¼ protein & ¼ carbs. #healthyaging tips w #marilynwetston #zoomerradio.