Most people outgrow their food allergies, although peanuts, nuts, fish, and shellfish are often considered life-long allergies. Randomly taking food out of your diet can leave you with an unbalanced diet that can cause other health problems. Additionally, you may become frustrated because you reach a point where you believe that everything you eat is causing a reaction. Seek the help of a doctor before making significant changes in your diet. Food intolerance is an adverse food-induced reaction that does not involve the immune system.
Lactose intolerance is one example of food intolerance.
A person with lactose intolerance lacks an enzyme that is needed to digest milk sugar. When the person eats milk products, symptoms such as gas, bloating, and abdominal pain may occur. A food allergy occurs when the immune system reacts to a certain food. Keep a food diary, for 1 to 2 weeks, of everything you eat, what symptoms you experience, and how long after eating they occur. This information, combined with a physical examination and lab tests, will help the doctor determine what, if any, food is causing your symptoms.