I admired Michelle Obama's effort to get kids on a healthy track. From what I know much of the school lunches went into the garbage because the kids hated it.
It also hasn't helped that school recess time has been reduced, as well as active P.E.
Kids also shouldn't be allowed on their phones  when the designated time is for being physically  active. 
Also, it would help if food stamps couldn't purchase things like ding dongs and other junk.