Roughly 7% of American adults and 5% of children have a diagnosed food allergy, making it one of the most common chronic health conditions in the country. That translates to tens of millions of people navigating ingredient labels, carrying emergency medication, and making daily decisions to avoid potentially dangerous reactions.
The Numbers for Adults and Children
CDC data from 2024 puts diagnosed food allergy prevalence at 6.7% among adults and 5.3% among children. In practical terms, that’s about 1 in 15 adults and 1 in 20 kids. In a typical classroom, roughly two students have a food allergy.
Among children, the rate increases with age. About 3.9% of kids under 5 have a food allergy, compared to 5% of children ages 6 to 11 and 6.9% of teenagers ages 12 to 17. That upward trend with age challenges the common assumption that food allergies are mainly a toddler problem. The CDC notes that overall prevalence of food allergies in children has been climbing for several decades, though the pace of that increase is difficult to pin down precisely.
Nearly Half of Adult Allergies Start in Adulthood
One of the more surprising findings in recent years is how many adults develop food allergies well past childhood. A large national survey published through Stanford Medicine found that 48% of food-allergic adults reported that at least one of their allergies developed after age 18. That means food allergy isn’t something you either outgrow or don’t. It can show up for the first time in your 30s, 40s, or later, often catching people off guard because they’ve eaten the food safely for years.
Among adults with convincing food allergies in that same study, 38% had experienced a reaction severe enough to send them to an emergency department. That severity rate helps explain why food allergy is treated as a serious public health issue, not just an inconvenience.
Which Foods Cause the Most Allergies
The U.S. recognizes nine major food allergens: milk, eggs, peanuts, tree nuts, wheat, soy, fish, shellfish, and sesame. Shellfish allergy is consistently the most common in adults, with an estimated 1.9% of the population allergic to crustacean shellfish like shrimp, crab, and lobster. Peanut allergy affects roughly 1.9% as well, while milk allergy sits around 2% and fish allergy is less common at about 0.4%.
These numbers shift depending on age group. Milk and egg allergies are more prevalent in young children, while shellfish allergy dominates in adults. Peanut and tree nut allergies tend to persist across the lifespan and are among the most likely to cause severe reactions.
Racial and Income Disparities
Food allergy prevalence is not evenly distributed across the population. Research from Northwestern University found that Hispanic, non-Hispanic Black, and Asian individuals all have higher rates of food allergy, each around 10.5% to 10.6%, compared to lower rates among non-Hispanic white individuals. Non-Hispanic Black individuals were also the most likely to report allergies to multiple foods, with over half (50.6%) allergic to more than one food.
The pattern with income is counterintuitive. Households earning more than $150,000 per year had the lowest food allergy prevalence at 8.3%. Lower-income households face higher rates and often have fewer resources to manage them, including less access to allergists, epinephrine auto-injectors, and allergen-free food options. Asian and non-Hispanic white individuals had the lowest rates of severe allergic reactions, suggesting that disparities extend beyond diagnosis to outcomes as well.
Emergency Visits and Serious Reactions
Food-triggered anaphylaxis, the most dangerous type of allergic reaction, sends an estimated 90,000 people to U.S. emergency departments each year. Anaphylaxis can involve throat swelling, a dangerous drop in blood pressure, and difficulty breathing. It requires immediate treatment with epinephrine and typically a trip to the ER even if symptoms improve.
Not every allergic reaction reaches that level. Many people experience hives, vomiting, or stomach pain that resolves without emergency care. But the unpredictability is part of what makes food allergies so stressful. A person who had a mild reaction to peanuts once can have a severe reaction the next time, with no reliable way to predict which it will be.
The Financial Burden on Families
Managing food allergies is expensive. Research estimates the annual cost of childhood food allergy in the U.S. at roughly $25 billion total, or about $4,100 per child per year. That figure includes medical visits, medications, and the less obvious costs that add up quickly. Nearly a third of families’ direct out-of-pocket spending goes toward buying allergen-free food, which often costs significantly more than conventional alternatives.
Beyond groceries, families spend on allergist appointments, epinephrine prescriptions (which can cost hundreds of dollars and expire annually), and sometimes specialized childcare or camps that can safely accommodate allergic children. For lower-income families, these costs can force difficult trade-offs between safety and affordability.
Food Allergies in Schools
With an estimated 1 in 13 children affected, virtually every school in the country has students managing food allergies. That works out to roughly two students per classroom on average. Schools have become a major front line for allergy management, with policies around nut-free tables, staff training on epinephrine use, and protocols for field trips and parties where food is served.
The challenge for schools is balancing inclusion with safety. Older children, particularly teenagers, are at the highest risk for fatal reactions, partly because they’re more likely to take risks with food and less likely to carry their epinephrine. The 6.9% prevalence rate among 12-to-17-year-olds means high schools carry a particularly significant burden when it comes to allergy preparedness.