Health & Wellness
Allergies & Immune System Quiz
Why does your body attack peanuts? The fascinating science of immunity.
Why does your body attack peanuts? The fascinating science of immunity.
The landmark LEAP study in 2015 showed that early introduction of peanuts to at-risk infants reduced peanut allergy by 81%. This 50-question quiz explores the science of allergies and immunity — from how IgE antibodies trigger mast cells to release histamine, to the Big 9 food allergens, anaphylaxis and epinephrine, the hygiene hypothesis, autoimmune diseases like lupus and Type 1 diabetes, and the years-long process of allergy immunotherapy.
Your immune system is a staggeringly complex defense network — but sometimes it gets it wrong. From the IgE antibodies that trigger hay fever to the autoimmune conditions where the body attacks itself, the science of immunity and allergy is full of surprises. Peanut allergy prevalence in US children roughly doubled between 1997 and 2011, yet a single clinical trial (LEAP, 2015) showed that early peanut introduction could cut risk by 81%.
Each round presents 10 randomized multiple-choice questions drawn from a pool of 50, so every playthrough is different. You get instant feedback with explanations after each answer, plus a shareable score at the end.
You'll explore innate vs adaptive immunity, the five classes of antibodies, how mast cells and histamine drive allergic symptoms, the Big 9 food allergens, environmental triggers like pollen and dust mites, anaphylaxis and epinephrine treatment, autoimmune diseases including Type 1 diabetes and lupus, the hygiene hypothesis, drug allergies, latex cross-reactivity, and allergy immunotherapy.
Food allergies have roughly doubled in Western countries over the past two decades. The hygiene hypothesis suggests that modern sanitation reduces childhood microbial exposure, leaving the immune system more likely to react to harmless food proteins. Other factors include changes in gut microbiome diversity, delayed introduction of allergenic foods (now reversed based on the LEAP study), increased processed food consumption, and possible roles for vitamin D deficiency.
On first exposure, B cells produce IgE antibodies that attach to mast cells. On re-exposure, the allergen cross-links those IgE molecules, causing mast cells to release histamine and other mediators. Histamine dilates blood vessels, increases mucus production, contracts smooth muscle, and causes itching. In severe anaphylaxis, this cascade can cause throat swelling and dangerous blood pressure drops requiring emergency epinephrine.
Yes. Roughly half of adults with food allergies developed at least one after age 18. Triggers include moving to a new area with different pollen, hormonal changes, shifts in gut microbiome composition, or first-time exposure to allergens like shellfish. Stress and illness can also alter immune function in ways that promote new allergic sensitization.
Last updated: April 2026