AFnord: Not me :P I'm blessed/cursed with a very high metabolism. If I were to eat low-energy food, I would simply not be able to eat enough to gain weight. I eat lot, far more than most other (it gets expensive!), and I'm still not overweight. If I were to eat fastfood, and only fastfood, I would probably start gaining weight though. mainly due to the french fries/chips and soda. While the hamburger dressing is usually rather fatty as well, and the bread contains too much sugar, the hamburgers are still not horrible meals.
AlKim: Yeah, I've got pretty much the same thing going; I can't really gain nor lose a significant amount of weight no matter what I do. Vigorous excercise only seems to increase the density but not the size of my muscles and any fat that I eat mysteriously disappears into another universe before my body has a chance to metabolize it into something ugly and big. It's a pretty good deal in my opinion.
Wait until you get older. ;) I was pretty much the same until my late thirties, but started gaining weight slowly, but steadily, afterwards, until it reached a stage where I actually had to start taking care about how much I eat, for the first time ever.
Some people have a metabolism which lets them "waste" superfluous energy though. Instead of storing it as fat, the body simply uses it to build and dismantle certain molecules until it's gone. It's like an automatic weight-loss exercise that takes place _inside_ the body - pretty nifty in times when there's more than enough food available.
DieRuhe: Sex sells everything. Simple. Look at that redhead in the Wendy's commercials - I just want to grab that beautiful hair and... well, I admit, it doesn't make me want to buy burgers.
That's exactly why "sex sells" isn't a particularly successful strategy. :) It _does_ grab the viewers attention, but it also steers that attention _away_ from the actual product. ;)