Really? Then couldn't one subsist by just eating one or two bars of chocolate per day and some vitamin pills? Or maybe a liter of coke per day would work just as well? It would be a very cost efficient way of eating as both candy and vitamins are cheap around here (well, not vitamins but a bottle of pills last a long time).

I've always assumed that that wouldn't work which is why I'm skeptical to your "it's all about the calories" argument.