By the time you order, you're hungry and your resistance to danger foods is low. If you decide to splurge on one item, keep that in mind with your other choices. Perhaps you love caesar salad that comes already dressed. In that case, order the salad as a treat and then round out your meal with soup and bread or choose a light entree and skip the dessert. Nobody said you can't enjoy the danger foods, just moderate your intake of them.
Many requests are easy.
Ask for the sauce or your salad dressing on the side. Ask that bread or chips not be brought to the table. Request that salad be substituted for the french fries, chips or coleslaw. Even if the menu doesn't offer a special option for a food you desire, ask your waitperson about it. Chances are the restaurant will be happy to accommodate you.