There's a name for that: Orthorexia nervosa.
It is indeed an eating disorder which is probably related to, and often overlaps, the other eating disorders. Unlike the other eating disorders, it seems harmless enough although irrational, a waste of time, and annoying to others. A waste of effort and money too. Basically another variant of the obsessional neuroses.
Vegans, organics, gluten freaks, Whole Foods, and all that silliness.
Nobody can define healthy eating and it doesn't matter as far as we can tell. Therefore, if you worry about food we say you just need to get a life. A social life, wholesome hobbies, etc. Unless you need to lose weight for health and vigor, to prevent arthritis and diabetes, etc, that is. Does your cholesterol count matter for anything? Not at all, unless you have the genetic disease of hypercholesterolemia which is detectable early in life. In that case, you take pills, cross your fingers, and pray.