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Natural and artificial food dyes are ubiquitous, but some people try to avoid consuming food or beverages of a certain color for different reasons. James Tarbox, M.D., Texas Tech Physicians allergist, explains that food dyes are added to food for aesthetic purposes and are generally safe. They can cause rare allergic reactions such as hives, swelling, shortness of breath and low blood pressure. To avoid allergic reactions, Dr. Tarbox recommends consuming fresh, unprocessed foods, reading labels carefully and making meals at home.