| IKENNA IKE | MOST COMMON FOOD ALLERGIES: HOW COMMON ARE THEY? WHY DO WE HAVE THEM? (PART 1) (@IKENNAIKE)br Food allergies are extremely common. If you don't have any food allergy that you know of, you most likely know someone who does. So common, in fact, that around 6 of adults have some sort of food allergy, and this stadistic seems to be rising.