Food allergy is an adverse clinical reaction to food due to any type of abnormal immune response to food protein.
Food aversion is psychological avoidance and psychological intolerance caused by emotions associated with food rather than the food itself.
Test used for the diagnosis of food allergies: it consists of eliminating the offending food and assessing whether the patient’s symptoms improve or not; then, during the challenge phase, the food is re-introduced to see whether symptoms return.
Any kind of negative reaction to the ingestion of food, beverage or food additive. Food intolerance does not provoke an immune response.