[2026] PTE Academic Reading - Re-order paragraphs

The human gut is home to a complex ecosystem of trillions of microorganisms known collectively as the microbiome.

These bacteria and fungi play a vital role in digestion by breaking down complex fibers that the human body cannot process alone.

Beyond nutrition, recent studies suggest that the microbiome also communicates directly with the brain via the vagus nerve.

This interaction, often called the gut-brain axis, may influence mood, behavior, and even neurological health.

Therefore, maintaining a diverse and balanced microbial community is increasingly recognized as essential for overall mental and physical well-being.