Obesity is not a sole frum problem, but alot of things the goyish velt does to fight it isnt done as much in the frum community. True we dont eat McDonalds or some other high calorie concoction, but we dont exercise either or eat healthy. There is definatly not a trend to eat more veggies , especially green ones. Alot of Shabbos food is grease and fat which is unhealthy.
How many frum people even play pickup basketball or Raquetball which are healthy exercises