> Does education work, in terms of improving health?
No. This has been beaten to death in dozens of studies going back to the 50s. Education does not trump brain chemistry.
> Shifting social norms, such that over-consumption is less socially acceptable might help.
It would help a lot, but food purity laws would help more. It would be nice if I could find a loaf of bread in a supermarket that didn't have HFCS in it.