What's the difference between food allergies and intolerance ?

Food allergy is a real disease which occurs when our immune system reacts to a specific protein present in a food & wrongly considered as a invader & consequently it triggers a protective response. core foods that trigger allergies like milk, soya, fish nuts, peantuts. Food intolerance is due to enzymatic deficiency characterised by inability to completely digest some food components like gluten, lactose.