Also anything that affects gut motility, so anything that messes with the nervous system in the gut.
If the signalling controlling eg the sphincter is messed up, the bile won’t escape to the intestines, and if the bile stops flowing you’ll get liver and pancreatic inflammation.
It might be that some toxin in the food could cause such an effect?
I’m not sure how easy it would be to tell if this was the case in an acute setting though. It isn’t exactly common, and is usually chronic and intermittent. Gall bladder removal would seem to be the wrong treatment in this case, but it might be hard to establish? My amateur medical knowledge is insufficient to know, just hypothesising other potential mechanisms.