For example, salad dressing. Today at work I decided to go to the grocery store and get all the ingredients for a healthy paleo-friendly salad instead of risking it with a chain joint. I succeeded!
But since I didn't have a container in which to make my own dressing, I decided to find one that was paleo-friendly in the salad dressing aisle. Wow! It took me about 10 minutes to find one that was even remotely ok, and even then it wasn't 100% perfect.
I had to decide between Newman's Own and Kraft (imagine that!!) and the deciding factor was Newman's Own had a much shorter ingredients list, even though it still contained some sugar (not corn syrup) and vegetable oils. The kraft had soybean oil much higher on the list, sugar as well, but many other ingredients near the end that were "chemical" in nature.
So I went with the one with more "natural" ingredients.
How do you decide between two sub-par foods, when you have to choose? (Please don't say "I don't pick either" as that doesn't really contribute to discussion) :)