Don't be shy. Ask the server about ingredients or preparation methods for the dishes you're not familiar with. You deserve to know what you're eating. For example, ask for steamed vegetables in place of French fries or fresh fruit salad in place of mayonnaise-laden coleslaw. If virtually everything on the menu is high in fat, ask the server whether the chef could prepare a fruit or vegetable platter for you.
Most chefs are eager to please.
Ask the chef to remove the skin from poultry, or remove it yourself at the table. Order all dressings and sauces on the side, so you can control your portions. Use them sparingly or not at all. Ask the server to have your food prepared without butter or cream sauces. Order vegetable side dishes.