Well, sure. Calories are a measure of heat energy: the more heat, the higher the calories. Thus, all food should be eaten cold, the colder the better. In fact, this basically means ice cream is the most healthy food out there. Eat moar ice cream!
Good one ;p I don’t think the “temperature” of a food changes its density, hence the amount of “whatever it is you want to get less of due to the current fad” will not be affected by the temperature unless the thing you want to get less of is the warmness of the food.
I wonder if the heating, then cooling, then heating is simply removing moisture thus making it more difficult to digest? I've also heard that the more "al dante" you leave pasta the less bad it is, possibly for the same reason.
Well, there was a study out recently that agrees with you on that, that unless your body is inefficient, as with a diabetic, that it can handle the insulin spike you get from white foods just fine. I read a thing saying the same about salt. Still, there is a logic to foods that require more energy to digest over a longer period of time naturally leaves you with a lower calorie count to deal with metabolically.