Absolutely! I think gradually building up also prevents you from upsetting your stomach too much, so that your body has time to wake up the digestive system that was previously shut down during fasting.
I would love to be able to have sweet potato and rice (congee) again after my refeed…I have emotional attachment to sweet potato congee as that is part of my childhood memory. I read that people generally go into OMAD and Keto after the fast and refeed, so still going low-carb. I wonder whether I would be able to slowly re-introduce starches (like rice and sweet potato) after the refeed period, whilst doing OMAD, without weight gain?