Raw-diet adherents might not think in these terms, but I would suggest that many of the health benefits stem from the much poorer absorption of macronutrients from raw food. Which allows you to eat quite a lot (leaving you sated), but doesn't actually provide a lot of calories (though potentially lots of other nutrients, like folate, vitamins, minerals etc., though some are easier to extract from cooked food also) Or you could eat less cooked food...