You can eat healthy away from home, even at fast-food restaurants. If you're ordering fast food, don't settle for what comes with your sandwich or meal. Ask for healthier options and substitutions. For example, ask for reduced-fat mayo or mustard on your sandwich. Or at a fast-food Mexican restaurant, request salsa with your meal instead of cheese sauce. Avoid special dressings, tartar sauce, sour cream and other high-calorie condiments.