| http://www.w3.org/ns/prov#value | - Reactions to chemical components of the diet are more common than true food allergies.[citation needed] They are caused by various organic chemicals occurring naturally in a wide variety of foods, both of animal and vegetable origin more often than to food additives, preservatives, colourings and flavourings, such as sulfites or dyes.[14] Both natural and artificial ingredients may cause adverse r
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