Five Food Allergy Myths We Hear Every Week

Food allergy diagnosis is messy. A positive blood test isn't the same as an allergy. A childhood reaction doesn't mean lifetime avoidance. Here's what we correct most often:

Myth 1: "A positive IgE test means you're allergic."

False. IgE sensitization is common; clinical allergy is much less common. Many people with positive tests eat the food without any reaction. We only diagnose an allergy when there's both a positive test AND a consistent clinical history.

Myth 2: "If you outgrew it as a child, you can't be allergic as an adult."

Most food allergies outgrown in childhood (milk, egg) stay outgrown. But adult-onset food allergies are real — shellfish and tree nut allergies commonly appear for the first time in adulthood.

Myth 3: "Avoid peanuts during pregnancy to prevent peanut allergy in your baby."

This was the advice until 2008. Modern evidence says the opposite: early, regular peanut exposure reduces the risk of peanut allergy in high-risk infants. The 2017 LEAP study confirmed this.

Myth 4: "Food allergies and food intolerances are the same thing."

They aren't. Food allergies involve the immune system and can cause anaphylaxis. Food intolerances (like lactose intolerance) are digestive and not life-threatening. Testing and treatment are completely different.

Myth 5: "If you're allergic, you need to avoid all traces forever."

Not always. Threshold varies by patient. And for peanut allergy in children, oral immunotherapy can dramatically raise the tolerance threshold. The goal isn't lifetime terror — it's accurate risk assessment and a plan.

Citations:

• LEAP study (NEJM 2015)
• AAAAI — Food Allergy Practice Parameter
• NIAID Food Allergy Guidelines 2017