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Food sensitivity or food intolerance is a condition where the individual cannot tolerate certain foodstuffs. The signs include diarrhea, constipation, Irritable Bowel Syndrome, hives, migraines and many other allergy-like symptoms.
The causes of food sensitivity / intolerance are poorly understood. In some it may be psychosomatic, where food is associated with some bad experience or due to direct chemical action on the brain. In some cases the immune system seems to be involved as patients often exhibit IgG antibodies to specific foods.
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