Parents should watch for reactions. Children are more likely to have food allergies than are adults. Many children grow out of these, often by around age six. When the wrong food is eaten, the allergic child's immune system tries to fight it off the same way it would a cold. Protein in foods is the most common cause of these allergies.
Symptoms can happen in any part of the body, including the stomach and bowels.
Food intolerance may cause symptoms similar to food allergy. People who have a food intolerance do not have an allergic reaction. They lack the enzymes needed to fully digest certain foods. This is true for milk. Many people are unable to process a sugar in milk called lactose.