Colonic bacteria, on digestion of dietary fibres would give
**Core Concept**
Colonic bacteria play a crucial role in the digestion and fermentation of dietary fibers. The anaerobic environment of the colon provides an ideal setting for these bacteria to break down complex carbohydrates, releasing short-chain fatty acids (SCFAs) as a byproduct.
**Why the Correct Answer is Right**
The digestion of dietary fibers by colonic bacteria involves the action of enzymes such as cellulase and xylanase. These enzymes break down the complex polymers of fiber into simpler sugars, which are then fermented by the bacteria to produce SCFAs. The primary SCFAs produced are acetate, propionate, and butyrate, which have various physiological effects on the body. Acetate and propionate are absorbed into the bloodstream and may influence glucose metabolism, while butyrate serves as an energy source for colonic epithelial cells.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct product of colonic bacterial digestion. While other metabolic byproducts may be produced, SCFAs are the primary result of this process.
**Option B:** This option is incorrect because it is not a direct product of colonic bacterial digestion. While certain amino acids may be produced through the breakdown of protein, this is not the primary focus of colonic bacterial activity.
**Option C:** This option is incorrect because it is not a correct product of colonic bacterial digestion. While certain gases may be produced as byproducts of fermentation, SCFAs are the primary result of this process.
**Clinical Pearl / High-Yield Fact**
The production of SCFAs by colonic bacteria has been linked to various health benefits, including the modulation of glucose metabolism, improvement of colonic health, and potential anti-inflammatory effects.
**Correct Answer: C. Short-chain fatty acids (SCFAs)**