Giving up favored foods involves the pain of heavy lifting -- trading up foods does not. But doing so either requires legitimate reformulations by food manufacturers, or our ability to make better choices among what's currently available -- or both.
But of course you see the problem. We are just picking poisons here. If we replace one way of eating badly with another and don't show health gains, does it prove that the first way of eating badly wasn't bad? No, it just shows that we have many flavors of poisons from which to choose.