I'm pretty sure it's not a new concept to me, but last night I was slightly inspired by the idea of spiritual food vs spiritual exercise. Too much food and not enough exercise makes you obese. I started wondering how far the metaphor stretched in terms of eating disorders. Spiritual anorexia is likely what you see in people who attend church only at Christmas and Easter - hardly feeding at all, and growing dangerously thin as a result. Spiritual bulemia is more like going to church every week, but forgetting everything on Monday. That's as far as I got.
Mokalus of Borg
PS - Perhaps there are spiritual food allergies: certain teachings that make you sick.
PPS - That might be good or bad, depending on the truth of the teaching.