Gluten causes health issues in people with celiac disease or other sensitivities to wheat products, but it is not bad for otherwise-healthy individuals, according to WebMD. Many foods containing gluten are useful in a diet by providing fiber and other essential vitamins and minerals to the body.
Gluten can damage the small intestine and prevents those with celiac disease from absorbing those essential nutrients into the body. Gluten doesn't have any nutritional value, but it's a protein substance that holds together whole grains, such as wheat and barley, that supply potassium, iron and calcium. Quinoa and amaranth are recommended grains for those with gluten sensitivities.