Poison ivy with mangos

 Poison ivy and mangos skin have the same chemicals, titled urushiol, that is on both mango skins and the whole poison ivy plant.

Meaning that if you were to touch poison ivy before eating mangos, your body could be conditioned to see the urushiol in the mango as poison ivy, meaning you could be allergic to mangos if you get in contact first with ivy.

So to be safe eat mangos so that your body gets used to urushiol, then you can touch poison ivy.