I typed it out cause I was bored and looking for something to do, basicly the highlited part is the important part if you're low on time.

"When calories are burned in a laboratory they are all created equal and release the same amount of energy. There is no difference between a thousand cal of kidny beans, a low fat muffin or cola-- until they are metabolized.
Your bodys metabolism is like the air resistance in the example above. The calories you eat are absorbed at different rates and have different amounts of fiber, carbs, protine, fat and nutrients, all of which translate into different complex metabolic signals that control your weight.
For example, the sugar from a soda enters your blood very rapidly while the same amount of sugar from kidney beans enters your blood slowly. If you drink a soda all the sugar in it goes into your bloodstream at once and the calories you aren't using at that moment will be stored as fat. On the other hand if you eat the kidney beans and the sugar in them is absorbed over time your body has a greater chance to make use of those calories. That means more will be burned and less will be stored. Also because of the high fiber content of the beans not all the calories will be absorbed. Recent studies have turned the idea that all calories are created equal on its head." pg 21-22 of Ultrametabolism: The Simple Plan for Automatic Weight Loss
 By Mark Hyman
http://books.google.com/books?id=ROZpwAolfS0C&printsec=frontcover&dq=how+to+order+off+a+menu+and+lose+weight&source=bl&ots=GerrOswb8o&sig=9dRS6p5-jAeTgjbKyIPMfZBJwz8&hl=en&ei=iu8ATYCsGdGpnge569jlDQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBwQ6AEwAA#v=onepage&q&f=false

The fiber thing is cool but it seems to imply without really saying that that is not the only reason. Why, exactly, do the calories from the beans not get absorbed as quick? Something to do with the protein and fat I'm sure.. it's annoying it doesn't say exactly though >.< I think it would be safer to just eat everything very very slowly to simulate that effect since I'm not sure what to look for in foods to know it gets absorbed slow. You know, just in case. And anyway, it could never hurt to make it even slower, right? :)