[dfxm12]

I think if the goal is that you want kids to eat less of this stuff, then just don't let kids buy it.

If the goal is to raise money, then maybe some sort of tax is the better bet, but you have to keep in mind who benefits from the raised money vs how much of their money you're taking. This would be a regressive tax & poorer people tend to eat more junk food and have more health problems, too. I mean, don't discount the externality that such a tax would disproportionately punish poor people for buying certain snacks.