Some scientists also worry that transplanting genes from one organism to another may cause deadly allergic reactions. So peanut allergy sufferers beware: One ongoing study is experimenting with using a protein from peanuts to extend the shelf life of vegetables. Another study on soybeans enhanced with a protein from Brazil nuts found that the allergen from the nut transferred to the soybeans. But before you whip out your EpiPen, the World Health Organization notes there haven't been any cases of allergic reactions from genetically modified food on the market right now.