When it comes to brain health, is microbiome science missing much of the world?

For more than two decades, scientists have uncovered remarkable links between the trillions of microbes living in our gut and the health of our brains.

This research has transformed our understanding of stress, depression, anxiety and neurodevelopment, opening new possibilities for preventing and treating mental illness.

What if much of this science is based on studying only a narrow slice of global diversity? ...