Beyond this, there's little evidence that a gluten-free diet offers any particular health benefits. However, a gluten-free diet can still be a healthy way to eat depending on which gluten-free foods you choose, how often you eat them and whether your other food choices are healthy ones.

Gluten-free' foods have to be free of gluten from any of the gluten-containing grains (more accurately, they have to contain less than 20 parts per million of gluten – a very tiny amount). Once again, these grains include rye, barley and spelt as well as wheat.

• wheat

• spelt

• rye

• barley

• bread

• pasta

• cereals

• beer