Why is it that no two foods can be blended together and produce a result that's poisonous? It seems very implausible that this should be the case, yet I've searched for counterexamples and cannot find any. I doubt anybody has ever tried blending up sardines and strawberries, yet somehow I can feel confident the resulting slurry would be perfectly edible, albeit probably disgusting.

The closest I could find to a counter-example was the combination of alcohol and mushrooms which contain the mycotoxin coprine. But alcohol is already a poison by itself, so I'm not really sure that should count.