If you're ever in Tokyo, the Meguro Parasitological Museum is genuinely worth a visit although maybe don't go straight out for sushi afterwards as we did.
Pictures of parasites: https://www.atlasobscura.com/places/meguro-parasitological-m...
Pictures of parasites: https://www.atlasobscura.com/places/meguro-parasitological-m...
I know there’s Ophiocordyceps sinensis which attacks caterpillars but that’s more traditional medicine than food.
https://www.smithsonianmag.com/smart-news/five-parasitic-spe...