The states with the lowest obesity rates still have a population that is hovering near or above 30%! "Figures don't lie but people can figure."
When you have a massive population convinced that they can step on a stair-climber for 1 hour, burn 300 calories, and then down a burger with 500 calories, yet look like the supermodel on television selling them some crap they don't need, it's pretty obvious what the result is going to be.
Americans in general are obese because they eat too much. Consider it a blessing. This has little if not nothing to do with bikes. Nice try though.