Can adding fiber supplements to food/drinks lower their Glycemic Index?

And, if so, how much soluble and/or insoluble fiber do you have to add to juice to make it as low glycemic as fruit?
Also, does it matter if the fiber supplement contains only soluble or insoluble fiber and how?

Note....I know fiber is often used as a LAXATIVE...that's not my question, if all you're planning to say is "fiber is (just) a laxative" answer at your own risk.

note...I don't mean very-high-glycemic potential foods and drinks (IE white bread, coke, mild juices)...but things like vegetable-juice, wheat bread and things with "good but not great" glycemic potential.

try to stay away from foods with high glycemic levels in them=I don't think fiber is going to help that

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