【How-to】How long does it take for prune juice to relieve constipation

Some of the natural bacteria in your large intestine produce gases (such as methane) that feed off of certain carbohydrates and sugars, most notably sorbitol. Some fruit juices, such as apple juice, prune juice, or cider, produce these carbohydrates and sugars, which can give you a stomachache and gas, Malkin said.