@Caeseji - My take on it iss if you're going to do OMAD, then an extra bit of attention to getting your nutrients makes sense, as there's no chance of picking anything up casually, in other things.
I'm not a total OMADer, although I have done several, largely unintentional nOMAD days (My self-termed nearly OMAD days), where I've just had something small on the hoof, like a piece of cheese or whatever, then one meal.
Like all things in this game, it's a case of plan, change, test, record (food, ddrink, blood scores, mood and general wellbeing - the latter 2 only really if anything of note), then at a future time, review. That'll inform you, from your own data, how
you are doing and where any tweakages might come in handy.