Bar the physically disabled - I would say they can all help it.
So what of the people that cannot conrol their eating because of stress, or other either mental or else problems? you do know that some people eat for comfort... thus when a stressful situation comes about they binge eat like no other.
Yeah sure there are meds and other thigns that can help but not everyone has medical insurance or access to the proper channels. Plus lets be honest, Odds are you know/are related to someone who is fat in an obese kind of way (FYI Obese is basically anything above 30 BMI) which by American standards it is QUITE common, and yes, i am fully aware that some people on this board are not americans (myself included)
Obesity can not only be a physical problem, but it can also be related to mental, emotional, and or psychological issues. Not everyone is fat because they dont care, nor because they want to.
You all should realize that a lot of things come into play with a person's weight.