Quick Answer
Some food allergies — particularly milk, egg, wheat, and soy in children — are frequently outgrown by school age or adolescence. Peanut allergy is outgrown in approximately 20% of cases. Shellfish and tree nut allergies rarely resolve on their own. An allergist can test whether a child has outgrown an allergy before reintroducing the food.
Food Allergies That Are Commonly Outgrown
Cow's milk allergy is outgrown by approximately 60–80% of children by age 5 and by more than 90% by age 16. Egg allergy resolves in approximately 70% of children by age 16. Wheat allergy is outgrown in roughly 65–80% of cases by adolescence. Soy allergy resolves in approximately 50% of children by age 7. These four allergies — often called the 'big four' for outgrowing — tend to appear early in infancy and resolve as immune tolerance matures.
A key predictor of outgrowing milk or egg allergy is the ability to tolerate extensively heated (baked) forms of the food. Children who can eat baked milk or baked egg in muffins or crackers are significantly more likely to achieve full tolerance and resolve their allergy than those who react to baked forms. Consuming baked milk and egg regularly while tolerating them may actually accelerate tolerance development.
Food Allergies That Rarely Go Away
Peanut allergy is outgrown in approximately 20–22% of children who developed it in early childhood. However, resensitization occurs in 8–15% of those who outgrew it, particularly if they stop consuming peanut regularly. Shellfish allergy (shrimp, crab, lobster, clams) and finfish allergy are rarely outgrown in childhood or adulthood — these typically persist throughout life.
Tree nut allergy (cashews, almonds, walnuts, pecans, pistachios) rarely resolves on its own, though each tree nut is a distinct allergen and someone allergic to walnuts may tolerate other nuts. Sesame and finfish allergy are similarly persistent. Adults who develop new food allergies — particularly to shellfish and tree nuts — almost never outgrow them.
| Food Allergen | % Outgrown by Adulthood | Notes |
|---|---|---|
| Cow's milk | 70–90% | Most resolved by age 5 |
| Egg | ~70% | Baked egg tolerance predicts resolution |
| Wheat | 65–80% | Distinct from celiac disease |
| Soy | ~50% | Often co-resolves with milk |
| Peanut | ~20% | Resensitization risk if peanut avoided |
| Tree nuts | <10% | Each nut is a separate allergen |
| Shellfish | <5% | Rarely resolves, often adult-onset |
| Finfish | <5% | Persists into adulthood |
How Is Allergy Resolution Confirmed?
An allergist determines whether a food allergy may have resolved by first checking specific IgE levels and skin prick test results. Declining IgE and a smaller skin test wheal over time suggest resolving sensitization. If testing suggests possible resolution, the allergist performs a supervised oral food challenge — the gold standard for confirming tolerance.
A supervised oral food challenge involves feeding the patient incrementally increasing doses of the food in a clinical setting with epinephrine immediately available. Passing the challenge confirms the allergy has resolved and the food can be safely reintroduced. Home challenges without physician supervision are dangerous and should not be attempted.
Can Oral Immunotherapy Help When Allergy Does Not Resolve?
For peanut allergy that does not resolve naturally, oral immunotherapy (OIT) is an option. Palforzia, FDA-approved for peanut-allergic patients ages 4–17, desensitizes patients to peanut through a structured escalation protocol, reducing the risk of a reaction from accidental ingestion. The treatment does not cure the allergy — ongoing daily maintenance dosing is typically required to sustain desensitization.
OIT for milk, egg, wheat, and tree nuts is also available in specialized allergy practices, though most products are off-label for these allergens. All OIT carries a risk of reactions during dose escalation and should only be undertaken with a specialist trained in food allergy management.
Key Takeaways
- Milk, egg, wheat, and soy allergies are frequently outgrown; shellfish, tree nut, and fish allergies rarely resolve.
- Peanut allergy is outgrown in ~20% of cases; regular peanut consumption after resolution prevents resensitization.
- Tolerance to baked milk and baked egg predicts eventual resolution of those allergies.
- Allergy resolution must be confirmed by a physician with supervised oral food challenge — not by home guessing.
- Oral immunotherapy can desensitize to peanut (and other foods) when natural resolution does not occur.
Related Guide
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