There is a known bug where rarely, some items in your stomach become indigestible. I'm looking into it ASAP. Thank you for playing, though! I hope you enjoyed what was there!
Tried 3 runs for now and it always happened, the eat action stops working entirely and he just starts starving, one of them didnt even get to the biggest size, so i cant say what is triggering it. Still enjoyed a lot the concept and having seeing the images of your dragon, i hope we can truly reach such sizes as well in the future, best of luck!
Downloaded the game and didnt have any issues, tough i think i see now what i was doing wrong, once you achieve a certain size, to eat food, you dont click on the button to do the action "eat" but on the plus inside it, i assume its, you are too big to feed yourself and have to assign a kobold to do it for you. Its amazing.