[rubber_duck]

I found this recently [1] suggesting that 15-18% of calories from peanuts are excreted. It's probably more for me since they give me digestive problems and that's what made me curios about the subject too.

So I guess eating processed food vs food that's hard to digest actually matters a decent bit if you're counting calories (10-15% of your calories is not insignificant - that's almost half of what you're trying to cut on a calorie restriction diet)

[1]http://www.peanut-institute.org/images/materials_10_19046826...

[winkle]

Calories not absorbed has also made me think about diets like the raw food diet. Eating raw uncooked vegetables is going to reduce the calories you absorb while taking up more volume in your stomach.