Not sure if its a bug or not, but one of my characters has like, a 6 in Digestion, and a massive like, 42 in capacity but the digestion rate is insanely fast. I can fill the bar up to max but the instant I do, it starts decreasing and takes like 5 seconds to empty making it practically impossible to keep the character full. Also yes, this is a new save that was made on version 0.4.
and no, my other characters aren't like this, only the one in the second slot of the first vertical row. (see attached image)
So with a 6 in digestion, the digestion speed is just near-instant? That doesn't make much sense, but then again, it's a game about making characters massive so ye. Just makes it harder to keep em fed, which, with one character nearly solely dedicated to giving happiness points (one of my characters has like, a 22 in happiness points), kinda balances it a bit.