A new paper shows peanut allergy diagnoses have dropped over 40% since 2017, all thanks to a “sea change” in medical advice. Experts explain what happened and what parents should know.
A new paper published in the Journal of Pediatrics reports a staggering 40% decline in peanut allergy diagnoses among US children since 2017. The reason for this dramatic public health victory is a complete reversal in food allergy guidelines.
For decades, parents were urged to do the opposite. In the late 1990s and early 2000s, common advice was to withhold peanuts—one of the most common allergens—until a child was at least three years old.
That all changed in 2015. A blockbuster study known as the LEAP (Learning Early About Peanut allergy) trial found that introducing peanuts to infants as early as a few months old could reduce their risk of developing the allergy by over 80%. This led to a complete shift, and in 2017, new guidelines were issued recommending the early introduction of peanut protein.
“A common misconception about food allergies is that delaying the introduction of allergenic foods may help prevent them,” states Dr. Stanislaw Gabryszewski, a co-author of the new paper. “We now have strong evidence showing the opposite – that introducing peanuts and other common allergens early in infancy can actually reduce the risk of developing an anaphylactic food allergy.”
Understanding the Allergy
So, what is a food allergy? Dr. Hemant Sharma, chief of allergy and immunology at Children’s National hospital, explains that the body mistakenly identifies a food as harmful and creates protective proteins called immunoglobulin E (IgE). These antibodies “attack” the food, resulting in symptoms like hives, swelling, vomiting, or difficulty breathing.
Allergies are a complex mix of genetics and environment. While children often outgrow milk and egg allergies, peanut allergies tend to persist, making them a common allergy in adulthood, along with tree nuts and shellfish.
This problem escalated in the late 1990s. Peanut allergies, once rare, doubled, prompting a “peanut panic” that led to peanut-free zones in many schools and airlines. The new data, however, suggests this trend is successfully being reversed.
How to Cautiously Introduce Peanuts
For parents, the new advice is clear: “early and often.” Here is what experts recommend.
1. When to Start Current guidelines from the American Academy of Pediatrics recommend introducing peanuts as early as four to six months of age.
Important Caveat: Children at high risk for allergies—such as those with severe eczema or an existing egg allergy—should be evaluated by a specialist first.
2. How to Introduce (Safely)
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Never give whole peanuts or thick peanut butter to an infant, as both are severe choking hazards.
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The baby should have good head and neck control and be ready for solid foods.
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Dr. Gabryszewski suggests thinning peanut butter with water or breast milk, “working towards about 2 tsp a few times a week.”
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Puffed peanut snacks that dissolve easily, like Bamba, are also recommended.
3. What to Watch For When introducing any new allergen, watch your child closely for reactions like hives, a rash, or vomiting.
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Mild symptoms (like a few hives) can often be treated with an antihistamine.
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Severe symptoms (like vomiting, coughing, or difficulty breathing) require immediate medical attention.
4. Keep It in the Diet If the child has no negative reaction, they can likely tolerate the food. The key is to continue exposing them to the food regularly. If a food is introduced once and then removed from the diet, the child “could become sensitized to it,” explains one expert.
Prioritize introducing foods that your family eats regularly. “If you’re eating communally at a dinner table, the baby’s going to want to eat what you’re eating.”
While early introduction doesn’t guarantee 100% prevention, Dr. Gabryszewski is optimistic. “This is a heartening indication,” he says, “that our growing emphasis on early introduction has been accompanied by a reduction in peanut allergy.”
