Earlier quoted context omitted.
No offence, but only an American could make the argument that because their weight has stayed "only" between 95kg and 100kg that they are living proof that people can eat what they want and not get fat. Unless you are a bodybuilder, which I am guessing you are not since they most certainly do care about what they eat, you are likely considered overweight in every other country on earth.
Well, here I am. Judge for yourself: http://photos-a.ak.fbcdn.net/hphotos-ak-ash1/24114_337315700... I drink over half gallon of soda a day, and survive mostly on $1 McChickens. So I'm either a freak of nature, or we don't know as much as we think we do about nature.
That said, you're pretty young, and your awful diet has evidently not caught up with you yet. When it does, I predict a swift re-evaluation of your ideas about nutrition and self-exceptionalism.