Not if you make good choices at the fast food restaurant. If you have a burger, skip the sauce, cheese, and other condiments. Choose low-fat milk or fruit juice instead of a soft drink or shake. Order pizza by the slice instead of the pan. Topping no-nos are, extra cheese, olives, sausage, and pepperoni.
Many pizza parlors feature salad bars.
Choose from the variety of fresh vegetables, and avoid the high-fat dressings and salads swimming in dressing. Order a plain baked potato. Ask for low-fat yogurt on the side, or if you know it is not available, take along your own from home. Order a child's portion for yourself. Smart fast food eating is not just a matter of what you eat.