Once I developed pine mouth (https://www.foodauthority.nsw.gov.au/about-us/science/food-r...). It was was one of the weirdest experiences I've ever had; I thought I had stumbled on some strange genetic metabolic disorder that was starting to manifest before I eventually figured out what it was. Basically, everything with carbohydrates started tasting super metallic and bitter, a little like soap or something, and it lasted for days.

At first I thought it was all pine nuts. Eventually, after being in a study, and with more attention and study of it, people figured out it's linked to certain reactions some people have to certain species of pine trees in Asia.

So then I started becoming picky about where the pine nuts come from, and discovered the US was a major producer of pine nuts up through WWII. I started buying pine nuts from local producers, from which I learned a fair amount about them, that there's different varieties of different size and oil content, with different taste profiles, oil content, and shelf-life.

I love pine nuts and am happy in theory to buy them from whereever, but it did open my eyes a bit to possibilities that aren't really being realized. It seems like the US market is drying up due to lack of demand and/or competition, but it would be interesting to see local producers thrive, with an emphasize on varietal quality, sort of like apples etc.