Fructose Intolerance

Hereditary Fructose Intolerance is a rare genetic disorder that lacks an enzyme called aldolase B. This enzyme is needed to breakdown the fructose. 

Fructose Malabsorption occurs when you lack GLUT-5, a fructose transporter. 


The following definition comes from an article from healthhype.com. It explains in more detail about fructose malabsorption and is worth the read if you want more information.

Fructose, unabsorbed in the small intestine, drags water from the intestinal vessels into the intestinal lumen, and travels toward the colon, where bacteria break it down to short chain fatty acids and gases (carbon dioxide, hydrogen, methane) that cause diarrhea and bloating.

Source: Fructose Malabsorption – Causes, Symptoms, and Diagnosis Written by Jan Modric   http://www.healthhype.com/fructose-malabsorption-cause-symptoms-and-diagnosis.html

See my blog entry http://fodmapliving.blogspot.com/2012/06/fodmaps-that-are-not-friendly.html for foods to avoid. 

Sources:

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001399/

http://www.mayoclinic.com/health/fructose-intolerance/AN01574

http://www.healthhype.com/fructose-malabsorption-cause-symptoms-and-diagnosis.html