I could be mistaken, since I didn't have time to test this more than once today, but after having previously eaten three marketplace foods today (on FoB), a fourth marketplace food did not update my fullness to 20. It wasn't a matter of lag, because it showed up fine in the CLI (and marketplace booze immediately after that also worked), and I'm quite sure I counted correctly, especially since I later managed to eat two hi meins, but not a third.
Edit: In case it wasn't clear, marketplace food refers to Hobopolis Marketplace food.
Edit: In case it wasn't clear, marketplace food refers to Hobopolis Marketplace food.