The Origins of Peanut Allergy

There's multiple studies that directly contradict the author's theory but none that support it. His theory is that early peanut butter exposure increases risk of developing a peanut allergy due to some batches containing a peanut fungus.

Here are studies showing the opposite - that early exposure to peanut butter decreases the likelihood of developing a peanut allergy:

LEAP trial: Early peanut consumption (via peanut butter/Bamba) reduced allergy by 81% at age 5.

LEAP On: Protection persisted even after a year of avoidance.

LEAP Trio: Protection lasted into adolescence (only 4.4% developed allergy).

CHOP 2025 study: Population level allergy diagnoses dropped after guidelines encouraging early peanut introduction, which was primarily in the form of peanut butter.

[1] https://www.nih.gov/news-events/nih-research-matters/providi...

[2] https://www.niaid.nih.gov/news-events/introducing-peanut-inf...

[3] https://www.chop.edu/news/childrens-hospital-philadelphia-re...