What is food intolerance?
When ingestion of a particular food or food additive
causes unpleasant symptoms, a person is said to be
intolerant to that food or additive. Symptoms occur as a
result of either poor absorption from the intestine into the
bloodstream or less commonly by the release of chemicals
within the body occurring as a result of contact of the food/
additive with the body.

The most common symptoms are:
gas, bloating, nausea, diarrhea and abdominal pain. Less
common symptoms include shock, welts, fluid retention,
rash, wheezing, inflamed sinuses/eyes/nose, vocal cord
swelling and, rarely, a migraine headache.