Doubt Is Cast on Many Reports of Food Allergies

Doubt Is Cast on Many Reports of Food Allergies
http://www.nytimes.com/2010/05/12/health/research/12allergies.html?hpw

"Part of the confusion is over what is a food allergy and what is a food intolerance, Dr. Fenton said. Allergies involve the immune system, while intolerances generally do not. For example, a headache from sulfites in wine is not a food allergy. It is an intolerance. The same is true for lactose intolerance, caused by the lack of an enzyme needed to digest sugar in milk."