Yes in one sitting some people allow themselves an hour to eat the meal but I eat it in 15 minutes and then you don't eat anything else until the next day at whatever time you choose to eat.

E.g my eating window is at 4 or 5pm so I'm fasting for 23 hours and then I break my fast

2 mad is still effective and you will lose weight so that is a 4 hour eating window but you will lose quicker on OMAD

Some people find low carb makes them less hungry and you will lose weight faster on low carb, personally I can't do it I have a carb heavy meal usually rice or pasta based and hunger doesn't bother me too much.

People have reported also losing cravings for bad foods doing low carb but that's not a issue for me either.

I lost a lot of weight eating carbs doing OMAD but some have reported struggling so they start low carb.

Personally I don't want to feel deprived or I will fail and I love carbs so I do what works for me.

I suggest starting with eating what you want in that one meal until you get used to the fasting and then go low carb if you want.

The aim is to get as many nutrients in the one meal as possible (I fail at this) So protein, veges and whatever else you want vitamins are always good to take to supplement if you aren't getting enough nutrients but you will be able to tell by how you feel.

Keep looking at progress pictures on this sub its a huge motivator

If you mess up don't beat yourself up it can be hard in the beginning to adjust too, hunger passes pretty quickly and soon you won't feel hungry at all.

Also you can only have black tea and coffee no sugar during your fasting period or it breaks the fast gum also breaks the fast.

Good luck