8. Cashew Nuts (Raw)
Cashews sold in stores are never truly raw—they’re steamed to remove urushiol, the same chemical found in poison ivy. If consumed raw and untreated, urushiol can cause severe allergic reactions, rashes, and even life-threatening complications. Safe cashews undergo a heat-treatment process to neutralize the toxin, making them safe to roast, salt, or turn into creamy nut butters.
How to enjoy without risk: Only buy commercially processed cashews—never eat wild cashews raw.