Find a place with food that you know what is in it. When I am dieting hard I love Mo Bettahs. Chicken is chicken.
Also if you google how to eat healthy at (insert restaurant name) you will find hacks. For example, Chick Fil A is 12 grilled chicken nuggets and the small Mac and cheese. 650 Cals 52g Protein, 33g Carbs, 34g Fat. Pretty decent for fast food.