[Lee Stewart]

If you love to snack on cashew nuts, you may be surprised to see them on this list. But in their raw, unprocessed state, cashews contain urushiol which is a chemical also found in poison ivy. It causes skin rashes and can be lethal if ingested in high doses. It's a good job the type you find in the grocery store are cooked at a high heat at least once before sale. Cashews might still be labeled as raw if they haven't been flavored or roasted further, but they will have been treated and are safe to eat.