When we eat these FODMAP sugars and they are not completely absorbed in the small intestine, the sugars continue to move through to the large intestine where a large colony of bacteria is present. This bacteria then begins to ferment the malabsorbed sugar, producing hydrogen, methane and carbon dioxide gases. The production of this gas can result in uncomfortable gastrointestinal symptoms including: bloating, stomach pain, stomach noises, flatulence, constipation and diarrhoea.
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What happens when FODMAPs are malabsorbed by the small intestine?