The vast majority of allergies result from eight food types: milk, peanuts, eggs, soy, wheat, tree nuts, fish, and shellfish. The incidence of these allergies has grown over time, perhaps as a result of better hygiene (so less allergen exposure early on), and clearly due in part to a lack of early introduction. Milk, eggs, and peanuts make up a large share even of these. We covered the peanut evidence earlier. Other research suggests a similar mechanism is at work for eggs and milk.14 The evidence on milk isn’t as convincing as the other two, but perhaps only because large studies have not yet
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