Ignore McDonalds and similar. You don’t have to eliminate fast food completely, but you should avoid it at all costs. Most of it is nasty, bad stuff anyway – if you’d even go as far as to call it food. If you’re looking for convenience, find a more convenient meal source. Besides, most of what they serve would be considered “food product,” not food. There’s a gigantic difference as far as your body is concerned. Your bloodstream does not have taste buds, need I remind you?