Apply your understanding of the human microbiome's role in digestion to explain how dietary changes might impact brain function.

• A. Dietary changes have no impact on the microbiome or brain function
• B. Dietary changes can alter microbiome composition, influencing gut-brain communication and cognitive functions
• C. The microbiome only affects digestion, not brain function
• D. Dietary changes affect brain function directly without involving the microbiome

Answer: (B)