some idiot could easily say to you, "dairy and grains are horrible for you".
that's the problem. everyone has a different definition of "healthy" in this country. and in their own minds they're all exactly right. except most of those same people are fat fucks who couldn't run a mile or do one pullup to save their life.
my wife is a registered dietitian. you should hear the stories she tells about how some parents feed their kids because of something their crossfit instructor told them. you'd laugh your ass off.
so in the end they can use whoever and serve whatever they want. will it be healthier? by someone's definition it will be.
As your wife surely knows, the science of nutrition is ever evolving and changing. We learn new things about what is an isn't healthy for us everyday. See my post about whole milk. This is a fairly recent finding, BTW.
My wife has type II diabetes (which is well controlled with diet and oral meds) and she suffers from chronic kidney failure. Recently she had acute kidney failure and was on dialysis for about 3 months. Considering her delicate health, her diet is more crucial to her survival than it is for most of us. After attending several classes on nutrition and diet designed primarily for kidney patients, I've come to realize how complicated eating healthy can be for some people. One thing that seems pretty obvious though is that processed foods are often much worse for us then unprocessed foods, such as fresh vegetables, whole grains and small portions of protein rich foods, such as meat and fish.
If you need proof of this, read the labels on processed foods. There is a whole lot of stuff in there the human body doesn't need, such as flavor enhancers and preservatives. The same is true for most fast foods.