The active ingredient in prune juice is the sugar alcohol called sorbitol. Sorbitol is sold as an osmotic laxative. Also, prune juice contains more fructose than glucose that is why it tastes so sweet. In this newsletter this is what Heather says about sorbitol
"Sorbitol (and other sweeteners ending in "ol") are sugar alcohols, chemically extracted from fruits and vegetables but very poorly absorbed by the gut. It's this malabsorption that results in the low calorie count of sugar alcohols, but also in the dramatic digestive upheavals they can cause. Sugar alcohols are so likely to cause gas, cramping, and bowel dsyfunction that foods containing these sweeteners are often labeled with a warning about their side effects, and cautions against eating a large amount. Personally, I would caution you against eating any amount of a sweetener that's virtually guaranteed to wreak havoc on your gut. "
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS