Why do you develop fructose malabsorption?

Fructose intolerance: Describes 2 possible conditions: hereditary fructose intolerance, a rare genetic disorder, is lack of an enzyme that breaks down fructose; it is serious and can lead to liver and kidney damage. Fructose malabsorption is difficulty digesting fructose and is less serious but can cause abdominal pain, gas, bloating and diarrhea. Restricting dietary fructose can help.