So, yes, the amount of calories in a certain food your body can use does differ from food to food, and even from the same food if it's raw v. cooked.  But that really won't matter if you're as fat as the average Redditor (Something Awful Goon or 4chaner or whatever).  If the person is 400 pounds, it doesn't fucking matter about the extra three calories saved from eating the egg raw, or cooling pasta before eating it.  But these are the things that people get caught up in while talking about weight loss.  Unless they're cutting for a bodybuilding event or something, a person can lose weight simply by reading the box, counting calories, and eating less.  We all know the story of Twinkie Professor.    tl;dr: quit being so pedantic.