The human gut hosts trillions of microorganisms collectively called the microbiome. Once dismissed as passive passengers, these microbes are now understood to influence digestion, immunity, and even mood. Studies linking gut bacteria to anxiety and depression have spurred interest in "psychobiotics" — probiotic strains that may improve mental health, though clinical evidence remains preliminary.
Which choice best states the main idea of the text?
- Acheck_circle
The gut microbiome is far more biologically active than once believed, with possible links to mental health.
- B
Probiotics are an effective treatment for depression.
- C
Researchers should fund more microbiome studies.
- D
Microbes outnumber human cells in the body.
Explanation
The passage reframes the microbiome as active and points to mental-health links — A. B overstates ("preliminary"); C is not stated; D is not advocated.