There are foods, additives and preservatives that produce adverse reactions in our immune system, causing a series of symptoms, more or less serious, that can be detrimental to the health of the patient. Usually, food intolerances produce gastrointestinal symptoms. If symptoms of food intolerance manifest, it is advisable to take a food intolerance test, which evaluates and determines which foods cause problems or adverse reactions in the body. Currently, there are two types of tests to detect the level of intolerance to certain foods: the Alcat food intolerance test and the Alpha 200 test. Both are blood tests but in no case are they completely reliable when it comes to discerning the main problem.