If you'd ever lived with somebody who is addicted to their rituals of
righteous grocery shopping, food storage, cooking, picky eating, and
droning that implies everyone else is an ignorant slob who doesn't know how to eat, you would know that orthorexia is a real mental illness, regardless of whether it is classified in the DSM (Diagnosis & Statistical Manual of Mental Disorders) for getting bills paid by insurance or government.
Worse yet is living with, or seeing next door, parents who inflict this disordered thinking and jail-like lifestyle on their innocent little kids in their most formative years.
We actually had neighbors whose kids would roam the (upscale) neighborhood, looking for food from other moms who allowed their kids to eat normally (which means allowed them to have a snack when they got home from school instead of forcing "no snacking" on them).
In the DSM, the other main eating disorders described here encompass much of what orthorexic behavior is:
Eating Disorders | psychiatry.org