Here is the McDonald's Picks for foods to eat if you are in a pinch. There use to actually be a few more selections but they have take a lot of them out of their menus. So if you do come across any of their wraps, getting them with grilled chicken is another good alternative. Overall though the list is short but it hopefully will give you an idea of what to eat when you are in a rush.
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Fast Food Cheat Sheet
This guide will teach you how to eat fast food and still lose weight at the same time.