Food allergy is an immune reaction, but food intolerance has no connection with the immune system.

Lactose intolerance is food intolerance where the enzyme lactase needed to digest milk sugar in milk and dairy products is absent in our body. This can cause diarrhoea, gas, abdominal pain and bloating.

A protein is responsible for milk allergy.

In food allergy, your immune system wrongly identifies a particular food or a component of the food as a harmful substance and attacks it. The symptoms can be tingling in the mouth, swelling of the lips, face, tongue and throat, hives, wheezing, breathing difficulties, dizziness and fainting.

In food intolerance you can eat small amount without a reaction and this should be found individually, but in food allergy, the smallest amount is enough to start the allergic reactions.