This e-book of Nutrition and Food Science focuses on food allergies and intolerances, which are often called hypersensitive reactions to food. These conditions affect some 1.5-3.5% of adults and 2-8% of children and it is an area of increasing interest in the developed world. People who have allergies to foods can react to minute quantities of the relevant foodstuff so it is vital that caterers, food manufacturers and anyone involved in food or nutrition has some understanding of this area.