A reader brought this beautiful series of food photos to my attention:
http://www.wisegeek.com/what-does-200-calories-look-like.htm
It's simply a graphic display of what 200 calories of various foods look like. You'll note that vegetables and fruits permit large servings to yield 200 calories. Processed foods, on the other hand, require very little to tally up the same calorie load. In particularly, look how little in the way of wheat products are required to match that amount.