Extreme obesity

Yes, increased capacity sometimes added cravings as your mind and eyes may want more than you can hold for the moment.
Similar to @allthebelly let it settle then push on.

I’ve eaten 3450 calories at one sitting and felt really full, weird.

Either way it's a wonderful feeling when you just eat and eat and eat and there's no sign of fullness in sight

I feel this all the time especially after eating an edible.