Munchies:
I mean... the broadest sense of the word, if you consume sustenance, you are on a diet.
I mean... the broadest sense of the word, if you consume sustenance, you are on a diet.
Well, by that definition, EVERYONE is on a diet, and being on a diet doesn't mean anything!
That said, weight gain diets have always been popular with certain flavors of feedists.
Quite true.
If I'm going to seriously try to answer the OP, I'd say choose a diet with LOTS of variety. That stimulates the appetite.
And don't do junk food exclusively. Eat one healthy meal a day and spend the rest of the day doing Dr. Feeder Challenges.

The Dr. Feeder Challenge:
2 years