Eli5, How does prune juice work to clear constipation?

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It works like a charm and how.

In: 32

It might be because prune juice contains sorbitol. This is a sugar alcohol known to cause significant digestive distress over a certain quantity. It seems to draw water into the large intestine, which can promote an impressive bowel movement.

My grandmother once ate a huge amount of Gummy Bears before she was discovered. That candy is full of sorbitol. After, she had the cleanest colon in North America and we had to do a whole lot of laundry.