The additional processed carbs are definitely to blame for how obese people are getting, but whole wheat isn't much better for you, in terms of the insulin spike you get from it.
For most people, simply avoiding the real junk is all they need to do. But if you simply replace them 1:1 with so-called "healthy" grains, you are going to be just as fat.
I guess it's a good thing "healthy" grains taste so bad, so it's pretty much impossible to eat as much of them
