I have been diagnosed with "fructose malabsorption", which basically means by body can't process the stuff.
(TMI warning) Basically, I get the runs BIG TIME just from eating just an apple!
The scary thing is when you find out just how many products have fructose or HFCS in them!
Giving up juice, and dried fruit was the most difficult for me tho!

There's lots of info on the net about what fruit and vegies to avoid and of course check labels on all your canned goods etc too.

Good luck with everything.