Mom was right. Breakfast really is the most important meal of the day. “When you go to bed, the body has to work to keep you alive and that burns calories,” says registered dietitian Kristin Kirkpatrick, wellness manager of the Cleveland Clinic’s Lifestyle 180 program. “You need to replenish your body when you wake up.” Breakfast will help your body and mind function better during the day and help boost your metabolism to burn more calories. Some smart choices for people on the go: single-serving bowls of whole-grain cereal or oatmeal topped with fruit, or whole wheat crackers or whole wheat muffins topped with cheese or peanut butter.