The Dr. Hyman Show: Fix Your Brain by Fixing Your Body – Metabolic Psychiatry Explained with Dr. Shebani Sethi

Host: Dr. Mark Hyman
Guest: Dr. Shebani Sethi, Founding Director of Stanford’s Metabolic Psychiatry Program
Date: September 24, 2025

Main Theme / Purpose

This episode explores the emerging field of Metabolic Psychiatry—a revolutionary approach reconciling psychiatry and medicine by examining the impact of metabolic health on mental health. Dr. Shebani Sethi, a pioneer in this field, shares cutting-edge research, clinical practices, and the paradigm-shifting view that mental illnesses like depression, bipolar disorder, and schizophrenia may be rooted in systemic and brain-based metabolic dysfunction. The conversation delves into scientific mechanisms, clinical interventions, novel biomarkers, and the promise of systems thinking for transforming mental health care.

Key Discussion Points & Insights

1. Defining Metabolic Psychiatry (04:21–07:10)

• Metabolic Psychiatry bridges metabolism and mental health, considering dysfunctions both “systemic” (whole body) and “central” (brain).
• Historically, psychiatry didn’t address how the body’s physiological changes influence the brain.
• Dr. Sethi emphasizes it's not just about neurotransmitters or the ketogenic diet—it's a holistic view that encompasses all metabolic pathways impacting psychiatric disease.

“Metabolic psychiatry is thinking about metabolism and mental health connection, but it's the study of all the metabolic dysfunctions, both systemic as well as central.”
— Dr. Sethi [04:34]

2. The Historical Context and Evolution of the Field (04:32–05:06; 09:35–10:41)

• Connections between metabolism and mental health are not new but faded as psychiatry shifted focus to neurotransmitters.
• Key historical biomarkers: Elevated lactate and low glutathione in serious mental illness.

“Levels of lactate... were elevated in serious mental illness, and... glutathione, which were low. They were markers of bioenergetic dysfunction.”
— Dr. Sethi [04:33]

• The “holy grail” of health may rest in understanding and optimizing metabolism, yet medical training typically under-addresses this after basic biochemistry.

3. Metabolism’s Impact on Psychiatric Disease (11:29–14:41)

• Dr. Sethi’s pathway: Started in obesity medicine, observed psychiatric symptoms improving with metabolic interventions.
• High comorbidity between metabolic disorders and mental illness:
  • ~40% of people with diabetes have mental illness. [14:41]
  • ~40% of bipolar disorder patients have metabolic syndrome.

“If you have insulin resistance, one in three people... that doubles your risk of developing depression, even if you have had no psychiatric history.”
— Dr. Sethi [14:57]

• Vicious cycle: Mood disorders reduce self-care, worsening metabolic health, further degrading mental health.

4. Insulin Resistance in the Brain vs. Body (16:42–20:09)

• Cerebral glucose hypometabolism: Brain regions unable to utilize glucose efficiently, seen in neurodegenerative and psychiatric conditions (bipolar, schizophrenia).
• Insulin resistance in the brain is not always mirrored in the body.
• Psychiatric meds can exacerbate peripheral insulin resistance and increase appetite.

“When you have insulin resistance in the brain, that doesn't necessarily mean that you'll have insulin resistance in the body.”
— Dr. Sethi [17:33]

• Insulin’s role: Essential for neural plasticity, growth, and hippocampal health.

5. Mechanisms: The Vicious and Virtuous Cycles (23:29–24:28)

• Mitochondria (cellular energy factories) are often dysfunctional in type 2 diabetes and psychiatric illness.
• Four key mechanisms: Plasticity, inflammation, oxidative stress, mitochondrial dysfunction.
• Interventions (diet, drugs) can shift from a vicious to a virtuous cycle.

“It's a vicious cycle of dysfunction ... but you can create a virtuous cycle by the interventions ... helping reset the brain energy system.”
— Dr. Hyman [24:12]

6. Interventions: Diet, Drugs, and Lifestyle (25:18–32:46)

• Anti-inflammatory approach is crucial; mere downstream anti-inflammatory drugs are less effective than treating root metabolic dysfunction.
• Drugs like Metformin (an insulin sensitizer) show neuroprotective benefits in mood disorders.
• Exercise proves potent for improving insulin sensitivity, increasing BDNF (“Miracle-Gro for the brain”) [28:55].

Nutrients & Supplements

• Omega-3 (EPA-rich) may help in early psychosis and depression.
• Addressing deficiencies (vitamin D, B vitamins, magnesium) is foundational.

“It's almost like a crime to not be thinking about ... if they're deficient or malnourished in some way. Most of them are malnourished.”
— Dr. Sethi [31:24]

7. Biomarkers: Towards Precision Psychiatry (34:02–39:11)

• No single biomarker will suffice—constellation of metabolic markers (triglyceride/HDL ratio, CRP, insulin, homocysteine, micronutrients, hormones, etc.) guide both diagnosis and therapy.
• New clinical trials at Stanford: Using ketogenic diet for serious mental illness, tracking deep profiles (metabolomics, proteomics, continuous glucose and ketone monitoring).

“We're taking a more holistic, system-based approach to managing psychiatric disease, beyond just symptom reduction.”
— Dr. Hyman [38:42]

8. Mitochondrial Function & ‘Omics’ Research (39:11–43:58)

• Deep collaborations across institutions (U of Toronto, Mayo Clinic) are underway to map mitochondrial metabolites and link findings to clinical outcomes.
• Cutting-edge data: Wearables, HRV, genetics (epigenetics), proteomics, and microbiome.
• Clinical focus: Variety in mitochondrial function in brain regions helps explain symptom variability.

“There's a whole universe ... between the breaking down of food and production of energy and waste products, what we call metabolism.”
— Dr. Sethi [72:07]

9. Real-World Application: Diet Trials and Patient Care (44:22–47:53)

• Ketogenic diet trials showed:
  • 100% reversal of metabolic syndrome in patients with bipolar or schizophrenia (in 4 months!)
  • 12% weight loss, 36% reduction in abdominal fat, substantial psychiatric improvement.

“When you take a drug for schizophrenia, all the side effects are bad ... here, all the side effects are good.”
— Dr. Hyman [45:51]

• Ongoing support (support groups, caregivers) essential for patient adherence.

10. Scaling and Access—Metabolic Psychiatry Labs (47:53–68:02)

• Dr. Sethi founded Metabolic Psychiatry Labs (metabolicpsychiatrylabs.com), a telehealth platform making precision metabolic mental health care accessible nationwide—not just in academic centers.
• Resources: Also offers a free education site (metabolicpsychiatry.com).
• Research, clinical care, advocacy, and AI-powered personalization intersect, forging a scalable model.

11. Integration with Other Modalities & Holistic Care (68:02–69:35)

• Advocates for comprehensive, patient-centered care—psychiatry integrating trauma therapy, psychedelic therapy, metabolic and microbiome interventions.
• Example of a child’s neuropsychiatric symptoms reversing after treating gut microbiome highlights the body–brain connection.

12. Emerging Science and Changing Paradigms (70:11–73:20)

• Omics data (genome, metabolome) offer unprecedented insight and may drive precision and personalization.
• Psychiatry must shift from symptom categorization (DSM) to root-cause, systems-based medicine.

“The work that you're doing at Stanford around metabolic psychiatry kind of breaks that through. But it's true across all of medicine ... We have to get to upstream medicine, root cause medicine, systems medicine, network medicine.”
— Dr. Hyman [65:38]

Notable Quotes & Memorable Moments

• “The greatest discoveries are discovered in between—in this intersection between fields.”
  — Dr. Sethi [09:35]
• “You can treat the neurotransmitters or you can treat the cause. Right. You can treat the symptom or you can treat the cause.”
  — Dr. Hyman [28:29]
• “Most of them are malnourished ... Overfed and undernourished, right?”
  — Dr. Sethi and Dr. Hyman [31:20–31:22]
• “If you have insulin resistance ... that doubles your risk of developing depression even if you have had no psychiatric history.”
  — Dr. Sethi [14:57]
• “It's about time, right?”
  — Dr. Sethi [70:08] (on the mainstreaming of metabolic psychiatry)

Important Timestamps

| Segment | Topic | |---------|-------| | 04:21–07:10 | Definition & scope of metabolic psychiatry | | 14:11–14:41 | Link between diabetes, metabolic syndrome, and mental illness | | 16:42–20:09 | Insulin resistance in brain vs. body | | 23:29–24:28 | Mitochondrial dysfunction in psychiatric disease | | 25:18–29:18 | Drugs (metformin), nutrients, and exercise for mental health | | 34:02–39:11 | Biomarker-driven psychiatric care | | 39:11–43:58 | Research on mitochondria, omics, and trial design | | 44:22–47:53 | Patient results: Ketogenic diet for serious mental illness | | 47:53–68:02 | Metabolic Psychiatry Labs—access via telemedicine | | 68:02–73:20 | Integrated care, paradigm shifts, future directions |

Additional Resources

• Metabolic Psychiatry Labs: metabolicpsychiatrylabs.com
• Education Portal (Stanford): metabolicpsychiatry.com
• Notable Article: “Metabolic Dysregulation and Metabolism-Based Approaches in Mental Health” (cited in show notes)

Takeaways for Listeners

• Metabolic health profoundly influences mental health—addressing nutrition, metabolism, micronutrients, mitochondrial function, and inflammation is critical.
• A systems-based, personalized approach is essential for optimal psychiatric care, moving far beyond traditional symptom management.
• Clinical and research pathways now exist to access metabolic psychiatry interventions.
• The field is evolving rapidly—listeners are encouraged to explore further resources and advocate for comprehensive health evaluations with their providers.

This summary encapsulates the main content and actionable insights from the podcast episode, preserving the original voices, scientific rigor, and practical optimism of Dr. Mark Hyman and Dr. Shebani Sethi.