Taking a few simple steps can help you prevent the symptoms associated with food intolerance. Learn which foods in which amounts cause you to have symptoms and limit your intake to amounts you can handle. When you dine out, ask your server about how your meal will be prepared. Some meals may contain foods you cannot tolerate and that may not be evident from the description on the menu. Learn to read food labels and check the ingredients for problem foods. Don’t forget to check condiments and seasonings. They may contain MSG or another additive that can lead to symptoms. Reviewed by the doctors at The Cleveland Clinic Department of Pulmonary, Allergy and Critical Care Medicine.