There's a tax on cigarettes. I wouldn't smoke as it is but I damn sure won't pay 5-8 bucks for a pack of cigarettes. A tax on soda, which is pretty cheap actually, is not a bad thing. Fewer people can afford to get it as much, which is good.
Like it's helped here. The nation of fat asses doesn't looked like it's helped much. If people want something they still go and find a way to go and get it. And hell, sometimes pop is still cheaper than bottled water.
Focusing on fast food joints may be the way to go though.
The poor are living extravagantly, if you see how much of their income ( percentage ) is spent on food in comparison to the rich, they really just cannot afford it.
Making things more expensive is not going to stop people, its just going to make people to spend more money, what people need is education. School was never good at teaching me what to eat, drink, or the repercussions of said food, and I think they should. However, not just children. The adults need to sit down and see what they are doing to their children.
The watershed is actually a good idea though, the less children see it the bettter, imo.
The parents DEFINITELY need education, the generation of children that are younger than us ( if we were to have kids I guess? ) are the first generation that may not out live their parents, due to obesity. That is bad.