Coeliac disease is an auto-immune disease where, when people with the disease eat gluten – a protein in wheat that is present in bread, pasta and crackers and more – a serious reaction in their bodies is triggered. The lining of the gut may be damaged, but nerve damage can also occur.

Even a breadcrumb containing gluten picked up from a butter dish can trigger a reaction, making the person with coeliac disease very unwell for days.