as a former obese person who weight 400 lbs, I would say it isn't especially something you choose, it just creeps up on you. At some point you know you need to change but we all know that long lasting change is extremely hard to do.
Like a lot of guys, I could eat anything and everything when younger, then between school and work 70+ hours a week, all I had time for was fast food, delivery, and carry out. Exercise? Who has time for that in our money driven economy?
I think there are several problems.
1The general public has no understanding at all of nutrition.
2: Convenience food (see my blog on trans fat -
Health Transformation)
3: Exercise is easier said then done.
4: have you looked at a school menu lately?
5: Things that used to be special treats only once and a while (such as pop) are now considered constant food.
6: Have you ever tried to eat healthy in a restaurant? Not easy, and even then the nutritional value is suspect - white rice, etc.
7. Exercising is easy for those who "know" how to do it, otherwise the gym is very very intimidating, and the cardio machines get boring pretty quick.
And for people like me, I can't be around my families much because the food they eat is absolutely horrible. For most obese people, they know they are overweight, but feel trapped and do not know how to "cope" or change. I consider myself lucky that I had professional people teach me about nutrition/how to eat and how to exercise. It requires a complete lifestyle change that according to a study at U of W, must be sustained for 9-15 months for habitual change to have officially occurred.