Unfortunately for ED patients a diet like this can often be another symptom of ED and its a common one for the recovery phase.
Oh, I see, I think I'm gettin it now. So with binge eaters, or eating disorders, there is always, or usually a "restrictive" component that goes along with it. They don't just eat normally, (whatever that is these days ?), and then have bouts where they binge. They do some compensation, or restriction, like eating very healthy, or only certain foods or only at certain time periods and then with that goes the binging.
When I was very young, I am pretty sure I was anorexic. Back then (it was long long ago, LOL) we never knew that word, or that there was a disease like that. Twiggy was in. This is what I can remember, I can remember looking in the mirror and thinking I was fat, but I wasn't, I was very thin. It was like literally seeing a fat person, it was an imagination so real it was like literally seeing that. Anyway, I remember the sense of power over my body I had, like I got off on having that kind of power, too starve, to deny myself. People would marvel at my thinness, and say I should be a model. That just fed the whole power trip.
What got me out of it, was that I got a new boyfriend. LOL, seriously. It was like with the new boyfriend, came a different life, and I wasn't so socially isolated and that broke the obsession.