Randomly decided to start eating one meal a day (for autistic reasons, not losing weight) and couldn't find any guides that don't devolve into "it cures cancer".
I'm doing mostly fine, but I don't want to learn that I accidentally screwed my health by doing something very wrong way after the fact.
I guess the person doing it would have to decide for themselves if it makes them feel better or not. One can always go do a blood vitamin check and see what they're missing, if anything.