> That's not quite true. Protein has 5 calories per gram, but labels only count 4 because of this fact.

Can you give me more information about this? I've always wondered whether or not calories listed are "net" calories (as in the number of calories you get after you extract calories from the food) or "total" (as in this amount minus the amount it takes to extract these calories). I'm just not sure what to google to read more :)