A food allergy reaction occurs when your immune system overreacts to a food or a substance in a food, identifying it as a danger and triggering a protective response.
Most food-related symptoms occur within two hours of ingestion; often they start within minutes. In some very rare cases, the reaction may be delayed by four to six hours or even longer
Once a food allergy is diagnosed, the most effective treatment is to avoid the food
The most common food allergens in adults are:
Fruit and vegetable pollen (oral allergy syndrome)
Peanuts and tree nuts
Fish and shellfish