High-Amylose Maize, Potato, and Butyrylated Starch Modulate Large Intestinal Fermentation, Microbial Composition, and...

Area of Science:

• Nutritional Science
• Gastroenterology
• Microbiology

Background:

• High red meat intake is linked to increased colorectal cancer (CRC) risk.
• Dietary fibers, like resistant starch (RS), may offer protection against CRC.

Purpose of the Study:

• To investigate if high-amylose potato starch (HAPS), high-amylose maize starch (HAMS), and butyrylated HAMS (HAMSB) can counteract adverse effects of high-protein meat (HPM) diets.
• To assess impacts on fermentation, gut microbiota, and CRC biomarkers.

Main Methods:

• Rats were fed either an HPM diet or an HPM diet with 10% maize starch substituted by HAPS, HAMS, or HAMSB for 4 weeks.
• Analysis included fecal fermentation, cecal microbial composition, and colonic biomarkers (oncogenic microRNA, O6-methyl-2-deoxyguanosine adducts).

Main Results:

• HAMS and HAMSB diets shifted fermentation towards carbohydrate metabolism.
• HAMSB significantly increased fecal butyrate concentration.
• HAPS and HAMSB reduced colonic oncogenic miR17-92 cluster miRNA expression, indicating CRC preventive effects.

Conclusions:

• High-amylose starches, particularly HAMSB, can alter gut fermentation and microbial composition.
• HAMSB demonstrates the most significant potential in mitigating the negative health effects associated with high-meat consumption.
• Further research into HAMSB as a dietary intervention for CRC prevention is warranted.