The "chemical imbalance" theory of depression has been quietly unraveling. Here's what the research says is actually driving it — and it starts in your gut.

For decades, depression has been explained as a brain chemical imbalance. That theory is increasingly understood to be incomplete — and a growing body of research points to neuroinflammation, heavily influenced by your gut microbiome, as a central driver.

In this episode, Dave breaks down what the current research actually says about depression's origins, why gut health may be a root mechanism rather than a wellness extra, and what this means for how depression should be understood and addressed.

What you'll learn:

- Why the "chemical imbalance" theory of depression is now considered incomplete

- How neuroinflammation connects your gut microbiome to depressive symptoms

- What fecal microbiota transplant studies reveal about gut bacteria and mood

- What "psychobiotics" are and how they're being studied

- Why gut-focused interventions may address a root mechanism, not just symptoms

Research referenced:

- Psychiatry Research (2016) — fecal microbiota transplant and depressive-like behavior in rats

- Valles-Colomer et al. (2019), Nature Microbiology — gut bacteria and neurotransmitter precursor production

This episode discusses depression. It is educational in nature and is not a substitute for professional medical or mental health care.

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