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.
Just because a meal contains all nutrients, that doesn't mean the body will have time or be able to process and use all of those nutrients. You can't just dump food/nutrients into your body and expect it all to be absorbed.
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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.