Akka
Moody old mage.
Sorry, but between your ridiculous claim about how exercize is useless and THIS, you are simply plastering the walls with ignorance - and bad advices.No. It's not different. We all are members of the same species and we all have the same metabolism.
First, yes, we all have very different metabolism. Second, yes, exercize is extremely good for the body - we're DESIGNED to, as it was said in a post here, run 10 miles a day to get food.
The fact you say to someone that you don't care about his personnal experience, but then base all your answer on your own, is funnily hypocrital - as you said yourself, one personnal experience is not something upon which you can make generalizations.
Diet is an important part, but exercize is just as important. In fact, hygienic life as a whole is important - sleeping also helps in keeping weight at a correct level, and even the times where you eat plays a noticeable role.
If there was some kind of magic "do this and become thin, no effort, no string attached" deal, you bet it would have made his inventor rich. But there isn't.