If you're new here, do me a favor and hit subscribe, and if this episode gives you something to chew on, a quick review helps more people find the show. Today's conversation is one of the most eye-opening we've done on the link between diet and severe mental illness.
Here's a claim that sounds almost too big to believe: in a small pilot trial at Stanford, everyone with schizophrenia or bipolar disorder who stayed fully adherent to a ketogenic diet went into remission from their mental health disorder. Not improved. Remission. Dr. Matt Bernstein is quick to qualify what that does and doesn't mean, but the underlying idea, that severe mental illness is in part a brain energy problem, is one mainstream psychiatry has barely begun to reckon with.
Dr. Matt Bernstein is a traditionally trained psychiatrist who spent years on inpatient units treating psychosis, severe mania, and catatonia with medications and ECT. Around 2010 he moved into psychosocial rehabilitation and came to believe that medications, while they stabilize people short term, can sometimes get in the way of long-term functional recovery. He now runs Accord, an immersive metabolic psychiatry program outside of Boston, where a chef, dietitian, personal trainer, and social worker help patients use diet and lifestyle to treat serious mental illness.
Bernstein's own path into this field started close to home. Around 2017, two of his three sons developed sudden, severe OCD, depression, and cognitive symptoms that turned out to be a form of autoimmune encephalitis. Not long after, he sat in a grand rounds lecture by Dr. Chris Palmer at McLean Hospital, a colleague he knew from residency, and says he may have been the only person in a room of about 150 who walked out fully convinced. He put himself on a ketogenic diet before ever prescribing it, and in retrospect believes he'd been insulin resistant himself. That personal experiment became the seed of Accord.
The biology centers on brain regions like the hypothalamus, hippocampus, and amygdala, which depend on insulin to pull in fuel. When those regions turn insulin resistant, the neurons that govern mood, memory, and anxiety start starving even while glucose is plentiful everywhere else. Ketones sidestep that problem, diffusing into cells without needing an insulin signal at all. Ravi and Bernstein walk through the evidence, including Dr. Shivani Sethi's Stanford pilot and a French inpatient series with effect sizes far beyond what antidepressants or antipsychotics typically show against placebo, while flagging clearly that both are single-arm trials with no control group. They also cover what the diet looks like day to day, the three month commitment it takes to know if it's working, and why it only works as part of a broader package of exercise, sleep, sunlight, and medical supervision.
Episode Resources
In this episode, you will discover
- Some brain regions, like the hypothalamus, hippocampus, and amygdala, rely on insulin to pull glucose into their cells, so when those regions turn insulin resistant, the neurons literally start running out of fuel.
- Ketones bypass that insulin gate entirely, diffusing straight into cells and delivering what Bernstein calls an immediate rescue to exactly the brain regions that govern mood, memory, anxiety, and psychosis.
- In a small single-arm pilot at Stanford led by Dr. Shivani Sethi, every patient with schizophrenia or bipolar disorder who stayed fully adherent to the ketogenic diet reached remission, alongside reversed metabolic syndrome markers.
- A 2022 French inpatient series of about 31 patients found effect sizes above 3 on standard psychiatric scales, compared to roughly 0.35 for SSRIs and 0.5 to 0.6 for antipsychotics against placebo.
- Bernstein tells patients they need to stay in ketosis for about three months before they can really know if it's working, and says he has yet to see someone reach that mark and feel nothing.
- Ketones activate a pathway called PGC-1 alpha that drives the growth of new mitochondria, which Bernstein thinks may matter even more than the fuel switch itself, and why some patients keep improving well past the one year mark.
- Ketones also turn on the gene for brain-derived neurotrophic factor, producing a more flexible, adaptable brain, which Bernstein calls the actual definition of mental health.
- Ketogenic ratios are measured in grams of fat to grams of protein and carbs combined, and while the original 1921 epilepsy diet used a 4:1 ratio, Bernstein usually starts patients at 1:1.
- Unlike the classic epilepsy version of the diet, Bernstein deliberately keeps protein high, because signals released from working muscle act as a growth signal the brain can pick up on.
- A single ketone reading can be misleading since beta-hydroxybutyrate can swing tenfold in a day, so Bernstein cares more about how a patient is actually doing than one afternoon fingerstick number.
- On a continuous glucose monitor, one patient's blood sugar spiked from a flat 60 to 90 line up to 140 purely from a panic-inducing phone call, and came back down within five minutes of slow breathing.
- Studies suggest a whole-foods ketogenic diet, built around things like ground beef, cheese, and onions, can be done on food stamps, so cost isn't the automatic barrier people assume.
Episode Highlights
- [00:00:00] Cold open: your brain runs on energy
- [00:03:27] What metabolic psychiatry actually is
- [00:08:44] Why psychiatry ignores the rest of the body
- [00:10:38] The 1921 keto diet and pediatric epilepsy
- [00:15:26] The forgotten 1960s schizophrenia study and Chris Palmer
- [00:19:48] Convincing the first patients to change their diet
- [00:23:59] Ketogenic ratios, from 4:1 down to 1:1
- [00:27:11] Why one ketone reading can mislead you
- [00:30:29] Gluconeogenesis and protecting glucose
- [00:35:11] UCSF and UK randomized trials
- [00:37:25] Exercise for depression: effective but hard to deliver
- [00:43:12] Children, and what he wishes he had known
- [00:46:35] Insulin resistant brain regions and starving neurons
- [00:50:44] Mitochondrial dysfunction and PGC-1 alpha
- [00:54:00] Can you cycle in and out of ketosis?
- [00:57:04] When the body looks metabolically healthy
- [01:01:30] The microbiome, sterile mice and Akkermansia
- [01:05:43] Do exogenous ketones work?
- [01:10:49] Lithium, diuresis and electrolytes
- [01:13:28] Type 2 diabetes is reversible
Key Takeaways
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