Continuing with our "Causes of Irritable Bowel Syndrome" series.
Gluten is a protein found in wheat, barley, and rye, and is responsible for the springiness and stretchiness of bread. Allergies and intolerances to gluten have been the subject of intensive research over the past decade.
Much of this research has focused on celiac disease, which is a special form of gluten intolerance. It is a hereditary response to gluten that results in a very specific type of damage to the small intestine. Common symptoms, which can mirror those of IBS, include loose stools, constipation, or both; fatigue; weight fluctuation; dermatitis; and more.
Celiac disease is diagnosed by measuring damage to the small intestine, either by blood testing or, traditionally, with a biopsy of the small intestine. A positive biopsy means that the villi, or small finger-like extensions of the intestinal lining, have been damaged; this is known as villous atrophy. However, recent studies have shown blood testing to be as accurate as a biopsy.
People with celiac disease will show a marked reduction in their villi, almost as if the villi have been worn off. Damage to the villi causes a dramatic reduction in the surface area of the small intestine, resulting in both poor digestion and the poor absorption of many nutrients.









































