I dare say if you are one of those unfortunate individuals near death from starvation, such as in the Yemen, fast food would be good for moving a step away from starvation. You would have your answer if you asked health workers what foods they provide in such states of emergency.
Let us pretend there is nothing to eat in the world beside fast food (how terrible!) then you could eat a burger made of lean meat and leave the bun and sauces, you could add a side salad, though in Mcdonalds the salads are pretty sad, wilting and minimal. do not include the slaw. I come to the end of ideas.
There are many options for fast food restaurants today. There is Subway, McDonalds, Burger King, Kentucky Fried Chicken and Taco Bell, to name a few. Each of these restaurants has foods that are healthy and foods that are not healthy. In the recent past, fast food places have opted to serve healthier choices for those who stayed away from these places due to the unhealthy food items on the menu. However, to make fast food good for you, the customer would have to be very selective when ordering.
Fruit, vegetables, grilled chicken sandwiches and salads would make fast food good for you. The French fries, hamburgers, chicken nuggets and desserts would be the items that are significantly bad for you.