As someone who can easily eat 4000 calories of real food in a single meal before feeling satiated, I have found that the fix for me is psychological and behavioral. I have an internalized belief that unless I carry on eating until I feel satisfied, then I will feel hungry and uncomfortable after the meal. However, this is not actually true - if I instead eat a reasonable sized portion for my height and activity level, then wait an hour, I do feel satisfied and comfortable. So the trick for me has just been mentally challenging that internalized belief that I need to eat until I feel full. If I just eat, stop, and wait, I feel great.