The one good thing about OMAD is that you can basically eat as much as you want and what you want during that one hour, and as long as that the only time you eat you will likely stay lean. I truly believe that this is the strategy that competitive eater/youtuber beardmeatsfood uses to stay lean while eating an immense amount of food in one sitting.

I have been toying with a 8 hour eating window followed by ~40 hours fasting (basically an evening + a whole day) of not eating, and seen some positive results.