I can confirm to have experienced similar situations before.
I think(not sure) i did that with cooked marsh marsh calla(roots). I had several pots of a small amount and poured it all together in one bowl.
When i ate it, the bowl was empty, and i still was hungry.
Occured to me on some more occasions. I think it was lake reed flatbreads.
I never was sure about it, because there is no way to really get a measure on that if you can not look into the code.
Just wondered why i was burning through my food supplies so fast.