Dietary fructose intolerance is your body's inability to digest the sugar fructose. There is no enzyme in the gut to digest fructose. Fructose occurs naturally in foods such as apples and pears, and people have been eating it for generations. However, what has changed is that many people in the United States today eat more fructose and in a purer form rather than mixed with other sugars.
Fructose intolerance is diagnosed by a breath test. It takes about three hours and is painless and non-invasive.
Treatment includes lifestyle and dietary changes.