I just had a thought: surely the amount of food on your plate should not be bigger than the size of your belly!
Think of a washing machine. If you overload it, the clothes won’t get washed as well as a half-full or even a 3/4 full load. Same with your stomach; if it’s too full, it will be more of a challenge for your stomach acids to break down the food properly, leading to poor absorption of nutrients in the intestines.
It reminds me of the idea that you should stop eating when you feel 80% full, because it indicates that your stomach is actually 100% full.
I know it’s tasty, but stop eating when you’re full. 😉