Israeli study: Skin contact with food allergens poses minimal risk to allergic children

A three-year study conducted across two major Israeli medical centers has produced findings that could reshape how schools and parents approach food allergies in children. Researchers at Meir Medical Center in Kfar Saba and Schneider Children's Medical Center in Petah Tikva set out to answer a question that has haunted countless families: Does accidental skin contact with allergenic foods actually trigger dangerous reactions in allergic children?

The answer, based on rigorous testing of 293 children aged one to eighteen, is no. The study, led by Dr. Idit Lachover-Roth, director of allergy and clinical immunology at Rambam Health Care Campus in Haifa, enrolled 192 children with confirmed food allergies and 101 controls. Researchers applied common allergens—milk, peanuts, eggs, sesame, and tree nuts—directly to the forearms of participants for fifteen minutes. Across 465 total patch tests, the results were strikingly consistent: in 83.7 percent of exposures, nothing happened. Not even a mark appeared at the contact site. Another 15 percent of children developed only mild localized skin reactions—redness or slight swelling that remained confined to where the food touched. Three children experienced somewhat more extensive reactions limited to the tested arm, all of which resolved after antihistamine treatment. Most crucially, not a single child experienced anaphylaxis or any systemic allergic reaction.

These findings directly challenge policies that have become standard in many kindergartens and nursery schools across Israel and beyond. Parents routinely face restrictions on what foods their children can bring to class—dairy products, peanuts, tree nuts, and eggs are often banned outright. The logic seems sound: protect allergic children by removing the trigger. But the study suggests this approach conflates two very different risks. Accidental ingestion remains genuinely dangerous and warrants careful prevention. Skin contact, by contrast, appears to pose virtually no threat when the skin is intact.

Lachover-Roth emphasized the human cost of current policies. "Many families live in a constant state of vigilance," she told The Jerusalem Post, "because they fear that even accidental skin contact with an allergenic food could lead to anaphylaxis." Some parents have become so fearful that they restrict their children's social lives—no birthday parties, no restaurants, sometimes no allergenic foods even in their own homes. The study's core message, she stressed, is straightforward: "Kids have to be kids. Touching allergenic foods is unpleasant for the children and their parents, but it's not dangerous if the skin is normal. If it happens, they just have to wash it with water."

The research did surface one notable pattern. Younger children were more likely to develop mild localized skin reactions than older ones, though even these reactions never progressed to systemic symptoms. Children with milk allergies showed a slightly elevated rate of localized reactions, possibly because milk is a liquid and its molecules penetrate skin more readily than solid foods. But across all age groups and allergen types, the outcome remained the same: skin contact alone did not trigger anaphylaxis.

Lachover-Roth was candid about the gap between evidence and policy. "School policy is problematic," she said. "They set down unreasonable limitations. There are almost no cases of severe allergic reactions in Israeli kindergartens and nurseries. Most are in restaurants and at home." She noted that researchers have attempted to persuade the Health and Education Ministries to revise their guidelines, without success. The restrictions persist despite evidence suggesting they address a risk that is, in practical terms, negligible.

The study does not suggest abandoning caution entirely. Children with food allergies should still avoid eating foods to which they are allergic, carry epinephrine auto-injectors when prescribed, and prevent oral exposure. The research examined only intact skin; contact with broken skin or mucous membranes was not tested and may carry different risks. Lachover-Roth also highlighted a separate problem: many teachers lack training in using EpiPens, and some refuse to take responsibility for administering them. School staff and their assistants are often reluctant to act in an emergency, leaving parents to rely on their own vigilance.

The broader context matters too. Food allergies affect five to ten percent of children in Western countries, but only two to three percent in Israel—a difference Lachover-Roth attributes to early exposure. Israeli children receive Bamba, a peanut-flavored snack, before their first birthday, which appears to build tolerance. The study's implications may eventually reshape school policies, but for now, the disconnect between what the evidence shows and what institutions require remains unresolved.