I have similar questions. What is normal for you without extra effort eating more protein?
I only do OMAD (not every day as I can’t do that… yet?), no EF though I plan to do them here and there, only short very rare ones, 2-3 days a few times a year, maybe. I needn’t worry about my protein at all as I tend to eat maybe twice as much protein as I need. I simply eat fatty protein most of the time, I need bigger meals too so it’s never a problem. I definitely don’t need 150g but if that was a case, I would eat that amount, sounds easy even with my aversion to most high-protein low-fat items. But if that wouldn’t be enough, I would stop eating OMAD, I am very serious about my protein intake and no way I won’t eat enough. That’s one reason I never want to do long fasts even if I could. My body handle things well enough for 1-2-3 days, maybe but then I would lose from my small, precious muscles. Nope.
I eat high protein because I need it for satiation and my taste dictates that too.
Multi day fasts may result in a smaller meal indeed, it’s a perfect time to forget about OMAD if you ask me. I try to eat accordingly to the wishes/needs of my body, I only do OMAD and EF if it doesn’t feel seriously forced.
These are my thoughts but as I eat every day and as my body rarely accepts way less than 2g/kg protein for LBM per day and it’s very easy to get from an OMAD sized meal, it’s easy for me. And my high protein days would be enough to balance out my rare short EFs if I had them I suppose. I did in the past and I probably will have them again eventually.
I never would do PSMF style days as that sounds pure torturous starvation to me. It may suit many people but I can’t even try it, no matter how curious I am as I am unable to eat tiny meals, I automatically continue to eat most of the time and get hungry in an hour and eat then another times. But as I wrote, it’s not necessary for me anyway. And my bodyfat isn’t enough to support such days I assume.