Some people just have this insatiable need to control everyone else's lives but their own. If these food nazis weren't trying to ban every good-tasting dish in the world, believe me, they would find something else to harp about whether it's your sex life, religion or what you watch on TV.
Don't let their acting like they're so concerned about your health fool you, either. They could care less. All they want to do is run your life just so they'll feel more powerful.....and not have to focus on their own pitiful existance.
Oh, and speaking of keeping me from drinking my favorite beverage, Coca-Cola, I'll quote Charlton Heston on that one...."From my cold, dead hands!" 
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"There is difference and there is power. And who holds the power decides the meaning of the difference." --June Jordan