That's great news though I'm a little suspicious, where have taxes caused a significant change in body weight?
> Junk food is only cheaper than healthy food because our society has made that choice, and it can just as easily choose to change that.
Junk food is cheaper because it's easier to make junk food. If you want to make food more palatable cheaply, make it denser, fattier, and sweeter. i.e. turn it into junk food.