Cashews and Poison Ivy? Time for another random health tip. Today we talk about the connection from cashews and poison ivy. Did you know that cashews and poison ivy are from the same family. This means they have some of the same toxins. So if you are eating cashews your body has to fight those toxins. Because your body is already involved in a fight with cashews you have less fighters to deal with poison ivy. Therefore, if you eat cashews then play in poison ivy your outbreak from poison ivy will be worse. So If you react readily to poison ivy wait to have cashews until after the first frost.