Dr Choudri has coeliac disease himself and knows the importance of a gluten-free diet.

BBC: NHS 'paid ?17 for gluten-free pizza base'

Coeliac disease is often diagnosed in childhood, and can be characterised by a distended stomach and stunted growth.

BBC: Birthday link to digestive disorder

Coeliac disease is caused by gluten, a protein that is found in wheat, and other similar proteins that are found in rye, barley, and oats.

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Coeliac disease sufferers can develop serious illnesses if they eat gluten.

BBC: NHS 'paid ?17 for gluten-free pizza base'

Gluten-free bread, cake mixes and bourbon biscuits are also available to people with coeliac disease, an auto-immune disease, which is triggered by eating gluten, which is found in wheat, barley and rye.

BBC: NHS 'paid ?17 for gluten-free pizza base'

Professor Paul Cicilitira is a Consultant Gastroenterologist at St Thomas' Hospital in London and has been leading a three-year study, funded by leading medical charity Action Research, to look specifically at coeliac disease and inheritance patterns.

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"The aim of providing gluten-free food products on NHS prescription is to encourage patients with coeliac disease to stick to a gluten-free, nutritious diet so they do not go on to develop more serious illnesses, which can affect their quality of life as well as being much more costly for the NHS, " he said in a statement.

BBC: NHS 'paid ?17 for gluten-free pizza base'