For years, the standard advice was to keep peanuts away from babies. Then a randomized trial tested the opposite, and the guidance flipped. Now there is real-world data: in one network of U.S. pediatric practices, diagnoses of peanut allergy in children aged 0-3 were lower after the guidance (data to 2019).[1][4]
That is rare in health advice: a well-meant rule overturned by a trial, then checked again in the wild. Here is what the evidence shows, what it does not show, and what it is worth borrowing if you are 40 or older.
What the LEAP trial tested
The Learning Early About Peanut Allergy (LEAP) trial enrolled 640 infants between 4 and 11 months old who were at high risk for peanut allergy because they had severe eczema, an egg allergy, or both. Researchers randomly assigned them to eat peanut regularly or avoid it until 60 months of age.[1]
Among the 530 infants whose skin-prick test for peanut was negative at the start, 13.7% in the avoidance group had a peanut allergy at 60 months, compared with 1.9% in the group that ate peanut. Among the 98 infants with a small positive skin test at the start, the figures were 35.3% and 10.6%. Serious adverse events did not differ significantly between groups.[1]
A follow-up study asked whether the effect was fragile. Children who had eaten peanut through age 5 then avoided it for 12 months. Their allergy rate did not rise significantly (3.6% at 60 months, 4.8% at 72 months), while 18.6% of the original avoidance group were allergic at 72 months.[2] The authors were clear that longer-term effects were not known.
From one trial to national guidance
In 2017, an expert panel sponsored by the National Institute of Allergy and Infectious Diseases published addendum guidelines with three separate recommendations for infants at different risk levels. They cover how to define risk, when allergy testing is appropriate, and whether the first peanut-containing foods should be introduced in a provider’s office or at home.[3]
Notice the structure. The advice is tiered. The infants with the most to gain from early peanut are also the ones for whom the first exposure deserves medical input.
What happened in real pediatric practices
A 2025 study in Pediatrics used electronic health records from a network of primary care pediatric practices run through the American Academy of Pediatrics. It compared children aged 0 to 3 who entered the network in three periods: 2012 to 2014, 2015 to 2017, and 2017 to 2019 (the last after the 2017 addendum). The two later periods overlap by seven months.[4]
- Peanut allergy diagnoses fell from 0.79% in the first period to 0.53% in the second, and to 0.45% in the third.[4]
- Any IgE-mediated food allergy diagnosis fell from 1.46% to 1.02%, then to 0.93%.[4]
That is encouraging, and the authors describe it as supportive of the guidelines’ intended effect. It is also an observational comparison across time periods, based on diagnoses. It cannot, by itself, show that earlier peanut introduction caused the drop, because other things changed over those years too.
What this does and does not tell you
- The LEAP trial studied high-risk infants. It did not test every baby, and it did not test older children or adults.
- If your baby has severe eczema or an egg allergy, ask your pediatrician about testing before the first peanut feeding; for mild eczema or no risk factors, the NIAID guidance covers when and how to start, so ask your pediatrician what fits your baby.[3] The guidelines exist because testing and setting matter. Your pediatrician decides the plan.
- Nothing here applies to an adult with an existing peanut allergy.
The Bettering Me angle: how to hold a health rule
Avoidance felt safe, so it became the default for many families, until a randomized trial tested the opposite. Most of us carry a few of those rules about food, sleep, exercise or screens. They came from a doctor, a parent or a headline, and nobody has checked them since.
Here is a practical way to use that. Pick one health rule you follow without knowing why. Spend ten minutes finding out whether it came from a trial or from caution. If it came from caution, mark it as open to revision and look again in a year. You are not trying to overturn anything. You are learning which of your rules are evidence and which are reflex.
If you are a grandparent or a family friend who feeds small children, add one more step. Guidance on early feeding changed in the last decade. Ask the parents what their pediatrician advised before you offer a new food, and follow that plan rather than the one you remember.
References
[1] Du Toit G, Roberts G, Sayre PH, et al. Randomized trial of peanut consumption in infants at risk for peanut allergy. N Engl J Med. 2015;372(9):803-813. DOI: 10.1056/NEJMoa1414850. Finding as used: 640 infants with severe eczema, egg allergy, or both were randomized to eat or avoid peanut until 60 months. Peanut allergy at 60 months: 13.7% (avoid) vs 1.9% (eat) in the skin-test-negative cohort (n=530); 35.3% vs 10.6% in the positive cohort (n=98). No significant difference in serious adverse events. ↑︎
[2] Du Toit G, Sayre PH, Roberts G, et al. Effect of avoidance on peanut allergy after early peanut consumption. N Engl J Med. 2016;374(15):1435-1443. DOI: 10.1056/NEJMoa1514209. Finding as used: After 12 months of avoidance, peanut allergy at 72 months was 4.8% in the early-consumption group (3.6% at 60 months, P=0.25 for the change) vs 18.6% in the avoidance group. Longer-term effects were not known. ↑︎
[3] Togias A, Cooper SF, Acebal ML, et al. Addendum guidelines for the prevention of peanut allergy in the United States: report of the NIAID-sponsored expert panel. J Allergy Clin Immunol. 2017;139(1):29-44. DOI: 10.1016/j.jaci.2016.10.010. Finding as used: The addendum provides three separate guidelines for infants at various risk levels, covering risk categories, appropriate use of testing, and the timing and approaches for introducing peanut-containing foods in the provider’s office or at home. ↑︎
[4] Gabryszewski SJ, Dudley J, Faerber J, et al. Guidelines for early food introduction and patterns of food allergy. Pediatrics. 2025;156(5):e2024070516. DOI: 10.1542/peds.2024-070516. Finding as used: In AAP CER2 network records of children aged 0 to 3, cumulative incidence of peanut IgE-mediated food allergy fell from 0.79% (pre-guidelines) to 0.53% (post-guidelines) and 0.45% (post-addendum); any IgE-mediated food allergy fell from 1.46% to 1.02% and 0.93%. Observational study. ↑︎
Kurt Greiner
Kurt is a digital strategist and IT professional blending emerging technology with practical application to help businesses and individuals streamline their digital presence. His current work focuses on the intersection of intentional living and technological resilience, exploring how individuals can leverage modern tools to navigate the second half of life with purpose.
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