I try to follow what I call the Pronounceable Diet. That means that I try not to eat anything I can't easily pronounce, specifically, things like TBHQ (tert-Butylhydroquinone), acesulfame potassium, cochineal, mono or diglyceride, etc. The purpose is to avoid un-natural chemicals in what I eat.
Do you even know what's in those things without looking them up? Were you aware that cochineal is a red coloring that's made from insects? Did you know that mono and diglycerides can be made of animal products? Bad news for vegetarians. There are so many preservatives and chemicals in today's food, it's no wonder we have the health problems we do. (foreign food is excluded from The Pronounceable Diet)
Instead, I try to eat fresh food. I make nearly everything myself, and I read every label and try to buy things with fewer than 10 ingredients to get the least processed food I can. Not only does the Pronounceable Diet have fewer preservatives, fresh food tastes much better! Next time you're grocery shopping, check out the labels. It's not a pleasant surprise.
Also, don't eat things with numbers, like red #40. If there's a number sign, it shouldn't be eaten.
(The picture is from The Onion)