Food intolerance is an adverse reaction to food which does not involve the body's immune system . It can be caused by a metabolic reaction to an enzyme deficiency such as the inability to digest milk properly ( lactose maldigestion ), by food poisoning such as ingesting contaminated or spoiled fish, or a food idiosyncrasy such as sulfite-induced asthma. See also:

• Chronic Ulcerative Colon
• Celiac Disease
• Crohn Disease