Coeliac disease occurs in 0.5-1% of the Australian population. It can onset at any age and often symptoms are present for many years before diagnosis. The symptoms include bloating, diarrhoea, lack of energy and anaemia. There is an allergy to a protein (gluten) found in wheat, barley, rye and oats. The diagnosis is made by obtaining a biopsy at gastroscopy while eating a gluten containing diet. The only treatment is a diet avoiding gluten, which is complicated and usually undertaken with the support of a dietician.