Larry, so your wife has a degree in nutrition and you are a physicist. So what? It doesn't mean what your wife has been taught is correct!
Current dietary advice is killing people, and I mean literally. And is based on no evidence or flawed evidence.
You are right of course, it is madness to think that "normal" food is unhealthy, and that most people develop syndrome X within a couple of decades of eating a healthy normal diet.
You are right because what we are eating now in the western world is not normal or healthy.
The interesting thing about the ancestral health movement (paleo, primal, lchf), is how many of the leaders of the movement are medical doctors, biochemists and scientists.
Maybe you should do a little reading, I suggest the following blogs, all have good science links to research, you may have your eyes opened!
Marks daily apple, robbwolf.com, thedietdoctor.
FYI, I have a science degree, my dh is a Dr, our dc who are also very interested in this woe are students of medicine & physics. We are not stupid and actually, neither are the other posters here!