What is the relationship between dietary fiber and colorectal cancer risk, and what role does fiber play in the gut microbiota?

What is the relationship between dietary fiber and colorectal cancer risk, and what role does fiber play in the gut microbiota?

• A. Higher fiber increases risk and has no effect on gut bacteria
• B. Higher fiber intake is associated with lower colorectal cancer risk and acts as a prebiotic supporting beneficial gut bacteria
• C. Fiber has no impact on cancer risk and reduces gut bacteria
• D. Fiber directly causes gut inflammation

Answer: (B)