As detailed by the Royal Prince Alfred Hospital Allergy Unit, food intolerances DO NOT involve the immune system, which is a fundamental contrast to food allergies. Food intolerances are caused by food chemicals which inflame nerve endings around the body. Symptoms are varied and include stomach pain, bloating, flatulence, diarrhoea, rashes, hives, recurrent mouth ulcers and/or headaches. If food intolerances are poorly managed, then these symptoms may significantly affect quality of life.
People vary in their food sensitivity and this can depend on the amount of food chemicals consumed. Some people are more sensitive and react more readily than others. The concentration of natural food chemicals differ significantly with the most common culprits being salicylates, amines and glutamates. Individuals who are more sensitive to food chemicals are also usually more sensitive to the added food preservatives, artificial colours and flavourings.