Hate to be the bearer of bad news, but fermented fish boosts IQ’s. If you can stomach it, eat it. I am being serious here. Fermented foods are safe and healthy. Pickled herring (Not really fermented) is a good way to start. Ideal diet = fermented meat and fish and milk with fresh veggies when you can get them, fermented when you cant. 0 cases of botulism recorded by the usda/fda for fermented foods. Cultures that embrace the nasty stinky (In our opinion only) foods are kicking our asses. I personally like some of the nasty reputation but damned delicious foods, but then I am an XYYY kind of guy. ;-)
That explains the bright idea for Sweden's open door immigration policy...