Food allergy—a common problem affecting about 8% of children and adolescents—greatly impacts the daily life of those affected and particularly impairs quality of life since it involves the immune system. With a food allergy, even a microscopic amount of the food has the potential to lead to a serious or life-threatening reaction called anaphylaxis. Cow’s milk, eggs, and wheat are staple foods in many diets, making them difficult and likely costly to avoid. Direct and indirect societal costs relating to pediatric food allergy in the United States have been estimated at nearly 25 billion USD.
Food intolerance or food sensitivity occurs when a person has difficulty digesting a particular food. This can lead to symptoms such as intestinal gas, abdominal pain or diarrhea. Food intolerance is sometimes confused with or mislabeled as a food allergy. Food intolerances involve the digestive system.