Peanut Allergy Study: One in Three Babies Cleared

The peanut allergy diagnosis many families have lived with may not be set in stone: a big Australian study found that more than a third of babies labelled allergic passed a supervised peanut test without any reaction. It is the kind of result that could change how doctors handle infant food allergies, and it surprised the researchers too.

What the study actually found

The work was led by the Murdoch Children's Research Institute and the National Allergy Centre of Excellence, together with ten children's hospitals across Australia. According to the Murdoch Children's Research Institute, thirty-five per cent of infants who had a recent reaction to peanut and a positive allergy test did not react during an oral food challenge.

In total, one thousand two hundred seventy-five babies under eighteen months were assessed, and seven hundred seventy-eight of them went through the challenge. Those babies came from hospitals in Victoria, New South Wales, Queensland, South Australia and Western Australia. The results were published in The Journal of Allergy and Clinical Immunology: In Practice.

How an oral food challenge works

An oral food challenge sounds scary, but it is a careful, medically supervised process. Babies are given slowly increasing doses of peanut while clinicians watch for signs of a reaction. New Scientist reports the total given is two thousand five hundred milligrams of peanut flour, about the same as two teaspoons of peanut butter, which is above the level where a truly allergic baby of this age would be expected to react.

The test came out of the ADAPT Peanut Oral Immunotherapy Program, which launched in 2024. In that program, babies get small daily doses of peanut to build tolerance, but they must first prove they are really allergic. That requirement is what exposed how many labels were shaky.

Why a rash and a positive test are not enough

Here is the twist. Many of the babies who passed had earlier developed rashes, swelling or hives after eating peanut, and had skin prick or blood tests pointing to an allergy. On paper, they looked allergic. Without the challenge, according to New Scientist, many of them would likely have kept avoiding peanut for years.

Program lead Kirsten Perrett described the result on ABC as "really surprising to us", adding that around one in three children thought to be peanut allergic could tolerate all the doses of peanut flour in hospital. The Sydney Morning Herald reported that a reaction plus a positive test was not enough to confirm a diagnosis in many babies, and that some may have a transient allergy that fades within about six months.

The risk is still real

Do not read this as a green light to try peanut at home. Sixty-five per cent of the babies did react during the challenge, and twelve per cent had an anaphylactic reaction that needed treatment from nearby medical staff, according to ABC News coverage of the research. That is exactly why the testing happens in a hospital where a reaction can be handled immediately.

So the lesson is not that peanut allergy is fake. It is that a suspected peanut allergy deserves a proper confirmation, instead of a label based only on a past reaction and a lab result. For the babies who pass, the payoff is huge: no long-term avoidance, less anxiety at mealtimes and no need for a treatment program they do not need.

What this could change

The researchers say the findings could shift how the healthcare system approaches infant food allergies, with more children getting their allergy diagnosis removed. The program's own medical lead stressed that confirming the allergy before committing a child to long-term treatment is key.

For Gen Z, who are heading into parenthood in the next decade, this is worth filing away. Food allergy rates have been a major health topic, and Australia has long been called the food allergy capital of the world. Better diagnosis means fewer kids carrying a label they may not need, and more clarity for parents who just want to know what is safe on the plate.

If you or someone you know has a child with a suspected peanut allergy, the move is to talk to an allergy specialist about whether a supervised challenge makes sense. More on this kind of story lives in our health section and the wider science coverage.

The big takeaway is simple: a diagnosis is a starting point, not the final word. This peanut allergy research shows that careful testing can rewrite a baby's story, and that is a rare piece of good health news worth sharing.