If the country has an obesity epidemic, then it's a systemic problem.
When you create this shoveling caricature of your fellow citizen, you support the fast food industry's claim that millions simply have a personal problem. Their shareholders are the ones eating your lunch.
So the answer is price controls to keep junk food cheap for the masses who can't control their eating habits? Makes sense.
And having loads of people with a particular personal failing doesn't make it not one. At some point people need to take some responsibility for their actions and work to improve themselves. Otherwise their lives will continually be mired in negative consequences.