There are food additives and preservatives that produce adverse reactions in our immune system, causing a series of more or less severe organic manifestations, which may even endanger the patient's health. When it is suspected that this happens to eat a particular food or group of foods is advisable to undergo a food intolerance test, a test that evaluates and determines which foods cause problems or adverse reactions in the body. Currently, there are two types of food test to detect the level of intolerance to certain foods: Alcat test and test Alpha 200, both are blood tests but in no case to be reliable when it comes to determining the underlying problem tests. In addition, the public health system are not covered yet and are proof of true economic cost.