Probability of Having a Peanut Allergy

Peanut allergy affects approximately 2.5% of American children and about 1.8% of adults, making it one of the most common food allergies. The prevalence has tripled over the past two decades, and peanut allergy is now the leading cause of food-related anaphylaxis deaths.

Peanut allergy is an immune system response to proteins in peanuts. Reactions range from mild (hives, tingling) to severe anaphylaxis (difficulty breathing, drop in blood pressure, loss of consciousness), which can be fatal. About 20-25% of children with peanut allergy will outgrow it, usually by their teenage years.

A landmark shift in prevention occurred with the LEAP study, which showed that early introduction of peanut-containing foods to high-risk infants (at 4-6 months) reduced peanut allergy development by about 80%. This led to revised guidelines recommending early introduction rather than avoidance. FDA-approved oral immunotherapy (Palforzia) and several investigational treatments (including epicutaneous immunotherapy patches) offer hope for desensitization, though they do not cure the allergy. Epinephrine auto-injectors remain the first-line emergency treatment.