Tom and his friend Dave drop by their favorile fast-food restaurant several times a week for a meal of hamburgers, fries, and shakes. Their parents 61 that this fast food will not provide the vitamins and minerals needed by growing teenagers Their basketball coach insists that their diet of high-fat, high-calorie food will-62 with their athletic performance. The boys, who are active and not overweight, see no 63 to change their eating habits.