I recently authored a post for Walden Behavioral Care's recovery blog on the topic of orthorexia. It's a bit of a tricky concept because it can be really challenging to live with this degree of rigidity and restriction, and at the same time, it can feel counter-intuitive and counter-cultural to wonder if there is such a thing as heating too healthfully or being too concerned about nutrition.
Check out my post on Walden's blog here.
If the topic piques your interest, some additional references that might be interesting are:
Jessica Setnick, a dietitian specializing in eating disorders, is one of the best resources. She did an excellent interview on the Gurze Eating Disorders podcast. There's also this article in Today's Dietitian.
Breaking Vegan, a book by Jordan Younger -- a book I recommend with reservations. It's certainly not trigger free (talk of behaviors, beliefs that aren't necessarily supportive of recovery), but she also describes her lived experience and mindset when she was in a phase of denial. I often hear from clients that these restrictive eating patterns feel better and "lighter," and her first-person narrative might help challenge the certainty that these eating patterns are right and beneficial, because making change can be scary.