The manufacturers of Monster Munches have no clout with me. Makers of food you don't like, for whatever reason, can only have clout if you buy their stuff. If enough people want to eat Monster Munches, so be it and good luck to the manufacturers. Now, here's the real clout: if enough people eat Monster Munches because some dude on the TV says they should (that's the clout you mean, isn't it? advertising clout), in short because they are suckers to advertising, even though I'm sure the munchers know that there isn't a great deal of food value in the Munches (though there is some, and all of what's in them is edible), then it's their own stoopid look out.
Someone will say, oh! but people don't know! Yes they do and it's revoltingly patronising to think otherwise because people aren't that stupid or, if they are, how on earth have we survived this far? How on earth are we gradually raising life expectancy rates throughout the world (yes, I know, slower in some places than we'd like, but it's still happening). Because food is food. If a thing is edible, it's food. There is food and there is better food but because we in the West have so much food and such a huge choice we have got silly and seem to think only "better food" should be allowed and people shouldn't be allowed to choose their own poison as the saying goes.
Any government that thinks it can interfere in my personal choices like that can damn well back off.