What specific non-digestible carbohydrates cause gas when fermented by gut bacteria in the large intestine?
Answer
Oligosaccharides
The well-known effect of beans causing gas is attributed to specific components that the human digestive system cannot break down in the upper GI tract. These are non-digestible carbohydrates called oligosaccharides. When these substances travel to the large intestine, they become substrate material that gut bacteria ferment. Although this fermentation process is beneficial because it feeds beneficial bacteria, the resulting byproduct is often uncomfortable gas for the individual, which can deter regular consumption despite the documented health benefits.
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