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Food intolerance and other reactions. There are a number of reactions to food that cause similar symptoms to a food allergy. Depending on the type of food intolerance you have, you may be able to eat small amounts of problem foods without a reaction.ommon conditions that can cause symptoms mistaken for a food allergy include: 1  Absence of an enzyme needed to fully digest a food. 2  Food poisoning. 3  Sensitivity to food additives. 4  Histamine toxicity.
Food intolerances are much more common. In fact, nearly everyone at one time has had an unpleasant reaction to something they ate. Some people have specific food intolerances. Lactose intolerance, the most common specific food intolerance, affects about 10 percent of Americans. food allergy is an immune system response. It is caused when the body mistakes an ingredient in food â usually a protein â as harmful and creates a defense system (antibodies) to fight it. An allergic reaction occurs when the antibodies are battling an invading food protein.