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Biology

Microbiome–Gut–Brain Axis Modulation in Major Depressive Disorder

Quick fact

About 90% of your body's serotonin—a mood-regulating neurotransmitter—is produced in the gut, not the brain.

Why this is interesting

Have you ever felt 'butterflies' in your stomach when nervous? That's your gut-brain axis at work—and it might hold the key to understanding and treating depression.