orthorexia
Noun
Meaning
orthorexia (uncountable)
(psychology) A fixation with healthy or righteous eating
Examples
Again, some will see this as balanced and reasonable, some will call it orthorexia.
Symptoms of orthorexia include compulsively checking ingredients lists, cutting out entire food groups and spending hours each day thinking about food one might be served, among others.
But, of course, there is nothing healthy about diet culture, which encourages everything from orthorexia, or an obsession with “clean eating,” to other forms of disordered eating in its pursuit of thinness above all else.
I don't mean to bring religion into what's already a somewhat heated debate, but based on your description the thought I had was: "One person's orthorexia is another person's kosher/halal."
It took me many years to realize that this way of thinking is just the beginning of the slippery slope to orthorexia — and yet it’s probably the most commonly argued veg(etari)an propaganda you’ll hear.
There is a lot of research to be done on orthorexia, but it is clear that the current societal fixation on “good” and “clean” eating poses a danger.