Prune juice and constipation?!

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Part 1 of your question is clearly answered by the other.
If you consume large amount of prune juice it should kick in within 3 to 4 hours.
There is not side effect, but not advisable to take in quantity if you have gastric problem.

Prune juice is a natural laxative which can used both by adults and children alike. Prunes are rich in fructose and sorbitol, hence are more effective than the other fruits. Fruits are rich in fiber, and the water content in them is also high. Prune juice supplies simple sugars to the body which helps in drawing fluids to the intestines. The fluid makes the stool soft and helps in bowel movement. If you are wondering, since prune juice provides sugars to the body, does it cause an increase in blood sugar levels? The answer to this question is no. Prune juice does not cause an increase in blood sugar levels. The reason behind this is that it contains natural sugars like fructose and sorbitol. As a matter of fact, too much of sorbitol can cause diarrhea.

http://www.buzzle.com/articles/prune-jui…