Hello. Heather's diet does not addresses the specific issue of fructose malabsorbtion. She concentrates on the IBS eating plan, whereas fructose issues are sort of a sub-category.
I am in the process of omitting fructose foods from my diet. Here is what I am doing: 1. No fruit. None. 2. No HFCS. Read labels. Anything with High fructose corn syrup...avoid. 3. No syrup for pancakes, natural or otherwise. 4. No jelly. 5. No gum/candies with HFCS. 6. No molasses. 7. No eating out if there is a chance for HFCS to be an ingredient...and of course, there is. 8. White and brown sugar are fine.
I know it may seem a bit extreme and rigid, but if you truly want to find out if fructose is an issue for you, then you need to make some scientific, controlled tests to find out. If you add any fructose during the testing period, you may not get a true outcome.