It's not like skipping gluten is a major hardship. Basically empty calories anyway. Why defend it?
I hate the words "empty calories". It's an oxymoron. Calories cannot be "empty", they are fuel for the body, they always have been.
Only years of fad-diets and food industry advertising could have turned a staple of human evolution as bread as something "evil".
As it has only existed since the dawn of agriculture, your tying of it to evolution is incorrect.
I was speaking of evolution in broad terms (as in, social and technological evolution as a race) not strictly in terms of darwinian evolution.