Moldy Coffee: Another Coffee-Afficionado Rabbit Hole
At some point in the past year or so, it has become a popular trend for coffee "experts" to preach that your beans are covered in mold. Not visible mold, of course. Invisible mold, with a scary name, that's apparently been causing your brain fog this whole time. Welcome to the mycotoxin rabbit hole.
On the actual data: the compound everyone points to is ochratoxin A, produced by molds that can grow on coffee beans during drying and storage. It's real, it's studied, and surveys do find traces of it in a decent share of green coffee. What the scary posts leave out is the dose. Roasting destroys most of it, brewing removes more, and regulators in Europe set hard limits on what's allowed in the bag. The amounts left in a typical cup are so small you'd never consume enough that it would be dangerous.
The fear has a traceable origin story. Around 2014 the "Bulletproof" coffee guy started marketing his beans as lab-tested and toxin-free, and a whole category of $25 to $30 "mold-free" bags followed. The pitch works because it's unfalsifiable at home: you can't see the toxins, you can't taste them, so the only cure is the expensive bag. Meanwhile wine, dried fruit, and cereal typically carry more ochratoxin than coffee does, and nobody is selling you lab-tested raisins.
My take: the rabbit hole is fun. I learned a ton about bean drying methods, storage humidity, and European food regulations than any normal person should for coffee. Cheap coffee can absolutely taste like dirt. That's a freshness and roast quality problem, not a poisoning.
So no, I'm not (regularly) buying the $30 bag. But I do check roast dates before buying, which I hold is one of the main things that matter making coffee.