THERE's your problem
"n a country where healthcare is funded by the public and is free at the point of delivery *we* fund the purchasing of these things."
THERE's your problem. I'm a firm believer that if you remove the CONSEQUENCES for irresponsibility, it's like removing the PEST PREDATORS from an ecosystem: you get pestilence.
it's not the CAUSE that ought to be attacked, but the PROBLEM. So why not "Tax the fatass" instead?? Or if fatty-fatty two-by-four can't fit through the kitchen door, then STOP! REQUIRING! KITCHEN! DOOR! MAKERS! TO! ACCOMMODATE! FATTY!! (admittedly allegorical)
But I can see this degrading into a discussion over BMI-related weight standards, which favors the 'skinny frame' lanky person over someone of Scottish descent [me] who has a barrel chest, short legs, and ultra-wide shoulders and weighs about 25% more than the average person due to being muscular.
[the REAL weight gain problem is from the high-carbo "low fat" diet foods anyway, right Dr. Atkins?]