If your pet has a food intolerance, it means that your pet is lacking the digestive enzyme to break that particular food down. So the reaction is not life threatening and may take hours or days after eating the food to manifest any type of symptom. Unlike a true allergy, where only a trace amount can trigger a reaction, with an intolerance symptom, it may manifest only if they eat a substantial amount of the food. So it is not the act of consuming the item often that creates the intolerance. The intolerance is always there, it is really the manifestation of the symptoms that becomes more apparent with overconsumption. That is why it is always recommended to feed in rotation and moderation after the initial elimination period to avoid triggering any unwanted symptoms.