Fructose is a sugar that is found in many foods such as fresh fruits and honey, high fructose corn syrup and many processed foods. Some people cannot completely absorb fructose in their small intestine-the beginning part of the digestive tract. The undigested fructose is then carried to the colon where our normal bacteria rapidly devour it.
The affects of dietary fructose on people who had irritable bowel syndrome and found that those who followed a low fructose diet reported an improvement in their irritable bowel symptoms. Fructose malabsorption is diagnosed through the use of the hydrogen breath test, which measures the amount of hydrogen in the breath following the ingestion of a fructose solution.