With a food allergy, your immune system causes an overreaction to proteins, triggering a histamine response and a near immediate reaction time.
Food sensitivities or intolerances occur in the digestive system when food is not properly broken down. They can have delayed reaction times (up to days later), and usually present vague symptoms.
A rotated diet is KEY to reducing negative responses to foods. It reduces inflammation, toxic load, hidden food sensitivities, and aids in the prevention of developing additional sensitivities.