Irritable Bowel Syndrome Message Boards | Re: Determining fructose

Fructose contained in sucrose is dealt with in the small intestine in a different manner than free glucose and free fructose. Fructose in sucrose is bound via an oxygen molecule to glucose. An enzyme process is required to break the two sugars apart.

In the review paper that linked to in my previous email it says "Sucrose is cleaved to glucose and fructose by sucrase, an enzyme located in the brush border of small intesting enterocytes. For unclear reasons, the absorptive capacity for fructose derived from sucrose exceeds that of fructose monosacchride in healthy individuals."

In summary fructose bound to glucose in sucrose appears to be handled by the body in a different manner that unbound or free fructose. This is evident from the fact that IBS suffers usually don't find white sugar or sucrose to be a trigger.

I have difficulties with fructose. I have been experimenting an idea. I have been adding glucose (dextrose) to fruits with more fructose than glucose. I buy corn dextrose from a local health food store. Recently I made some grape jelly in which I added enough dextrose to ensure that it contains more glucose than fructose. I seem to be able to eat it without problems. I need to do more experiments. Perhaps you can give it a try and report back your experience.

I am not sure about fruits that have high but equal amounts of glucose and fructose. Personally, I would experiment and if a fruit gave me problems I would stay from eating it.

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