The methodological limitations in some studies included in this review, reduce our certainty in the degree of benefit, but as more high quality studies are undertaken the benefits and practicalities of how to introduce these foods are likely to become clearer.

The causes of food allergies are not fully understood and the number of people with food allergies and coeliac disease is rising in the UK. Current NHS advice is that potentially allergenic foods can be introduced one-by-one during weaning to check for any allergic reaction, but advice is under review.