As soon as the groupie finds out that you make errors in everyday life like everybody else does and that you are human, they turn on you and hate you.
I do follow a version of the Dukan diet, but I don't follow it to the extreme so a lot of fish and vegetables. If I want chocolate I'll let myself have a bit of chocolate in moderation.
It's one thing to be religious, but it's another thing to make religion your policy.