Food Intolerance:
The immune system in not involved in a food intolerance. An intolerance occurs when the body does not make enough of an enzyme in that food and therefore has difficulty digesting the food. Symptoms are slightly different and less severe. For example, a lactose intolerance is when the body does not make enough lactase enzyme, which is the component that helps digest the lactose (lactose is the sugar in dairy). The symptoms may include stomach cramps, bloating, diarrhea, and gas. A food intolerance is not life-threatening, and can be managed by either avoiding that food or taking a supplement with the deficient enzyme.

Food Sensitivity:
Another term for an allergy or intolerance.

Food Aversion:
Avoiding certain foods based on personal preference or psychological reasons.