Living with allergies can be a nightmare. From not being able to indulge in ice cream or not being able to own a pet to feeling like you’re always on the verge of coming down with the flu, allergies can make life difficult. Many people suffer from allergies, which makes it even more surprising that we have no idea why they have a tendency to come and go, seemingly at random. Almost any kind of allergy can disappear—and reappear—over time. Some people may find their symptoms are occasionally greatly reduced, even if they don’t go away completely.Peanut allergies are among the most potentially dangerous types of allergies, and it’s recently been discovered that about 20 percent of people who have peanut allergies as children lose their sensitivity as they get older. As much as 80 percent of children with milk allergies outgrow their sensitivity by the time they’re in their teens, and those allergic to eggs will also commonly outgrow the allergy. Blood tests can tell if an allergy is going away, and sometimes desensitization done with small amounts of food or food prepared in a certain way can help—but this should always be done under the supervision of a doctor. Even stranger is the fact that kids today are much more likely to outgrow their allergies than the kids of the last generation, which raises more questions than it answers.