Sourness

Why do we like sourness?

We’ve lost the ability to produce vitamin C, or ascorbic acid, and liking acidic foods might be a way for us and other primate species to be reminded to ingest it. Another argument is that ancient primates ate way more fermented foods than we recognize. One way to tell if rotting fruits are safe is if they’re acidic, because the thing that makes them acidic is lactic acid bacteria and acetic acid bacteria. The acid in these bacteria kills bad new bacteria, so those fruits are almost always safe to eat – https://www.science.org/content/article/pucker-why-humans-evolved-taste-sour-foods