If you grew up in the 90s or early 2000s, your parents were almost certainly told to keep peanuts away from babies and toddlers. It was standard advice from doctors and health authorities across Canada: delay exposure, stay cautious, protect your child. Decades later, that advice has done a complete 180, and the science behind the reversal is worth understanding.
What the Old Advice Said
For much of the late 20th century, the prevailing medical consensus was that early exposure to highly allergenic foods, like peanuts, tree nuts, eggs, and shellfish, could trigger allergies in young children. Parents were advised to avoid introducing these foods until toddlerhood or even later. The logic seemed sound: if something causes an allergic reaction, keep it away.
But rates of peanut allergy kept climbing. By the 2000s and 2010s, peanut allergy had become one of the most common and potentially life-threatening food allergies in children across Canada and other Western nations. Something wasn't working.
The LEAP Study Changed Everything
The turning point came from a landmark clinical trial called the LEAP study (Learning Early About Peanut Allergy), published in 2015. Researchers found that children at high risk for peanut allergy who were regularly fed peanut-containing foods starting in infancy were significantly less likely to develop an allergy compared to those who avoided peanuts entirely.
The results were striking enough to prompt health authorities around the world, including those in Canada, to update their guidance. The immune system, it turns out, is more likely to learn tolerance when exposed early and repeatedly, not when shielded from a food altogether.
What Parents Should Do Now
Current guidance from Canadian health organizations recommends introducing peanut-containing foods to most babies around 6 months of age, in an age-appropriate form (think thinned peanut butter, not whole peanuts, which are a choking hazard). For babies with severe eczema or an existing egg allergy, both risk factors for peanut allergy, parents are encouraged to speak with their doctor or allergist first, as some may benefit from allergy testing before introduction.
For the majority of babies with no elevated risk, early, regular introduction is now considered protective, not dangerous.
Why It Matters for Canadian Families
Food allergy affects roughly 1 in 13 children in Canada, with peanut allergy among the most common triggers for anaphylaxis, a severe, potentially fatal reaction. The annual cost to the Canadian healthcare system and families dealing with food allergies is significant, making prevention all the more important.
The shift in advice also underscores a broader lesson: medical guidance evolves as evidence accumulates. What felt like cautious, responsible parenting a generation ago turned out to have the opposite effect. Today's parents are in a better position, armed with clearer science and more specific, evidence-based guidance.
If you have questions about introducing allergens to your baby, a conversation with your family doctor or a pediatric allergist is always a good starting point.
Source: CBC Health. Read the full story at CBC.ca.
