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There is a water soluble sugar that is in beans called oligosaccharides and they are indigestible by human beings. They ferment during the digestion process and hence you have gas.

"World Chefs: New cookbook spills the beans ... on beans". Interview with Patricia Reaney, in.reuters.com. February 28, 2012.
There is a water soluble sugar that is in beans called oligosaccharides and they are indigestible by human beings. They ferment during the digestion process and hence you have gas.