What particular type of insoluble fiber acts as a prebiotic, feeding beneficial gut bacteria and leading to SCFA production?
Answer
Resistant starch
Resistant starch is a specialized form of insoluble fiber found within corn kernels that resists digestion in the small intestine. Because it passes intact to the large intestine, it functions effectively as a prebiotic, meaning it serves as a primary food source for the beneficial microorganisms populating the gut microbiome. The subsequent fermentation of this resistant starch by gut bacteria yields short-chain fatty acids (SCFAs), which are essential for colon health and may reduce the risk of colorectal cancer.
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