Dr. Mercola's website has so much interesting health information it is hard to stop browsing through his site. Here is a good one, the five worst "foods" to eat:
french fries (almost all commercially fried foods)
fried non-fish seafood (all fried seafood would actually go in the prohibitive commercially fried foods but non-fish seafood is even worse)
So, really it comes down to fried foods and soda are the two worst types of so-called "foods" we can eat.