Essentials: The Science & Treatment of Bipolar Disorder

This Essentials episode is a condensed pass over bipolar disorder, and Huberman frames it as a serious one: the condition affects roughly 1% of people, typically presents between 20 and 25 years old, and carries a 20 to 30 times greater risk of suicide. Most of the first third is the clinical picture. A psychiatrist evaluating for a manic episode is looking for at least three of seven symptoms — distractibility, impulsivity, grandiosity, flight of ideas, agitation, no sleep, and rapid pressured speech. Bipolar I requires those symptoms to run seven days or more; strikingly, someone in a manic episode can go a week or more on essentially zero sleep and not be bothered by it. Bipolar II is characterised by shorter manic episodes, around four days or less, or by hypomania that is less intense, and is more often paired with the drops into major depression. Huberman is emphatic about erasing the sine-wave picture: bipolar I does not necessarily involve depressive episodes at all, and some people rapid-cycle through manic, normal and depressed states in three-day stretches, which is part of why a psychiatrist seeing only a snapshot has such a hard diagnostic job.

The treatment history is the set piece. John Cade was an Australian psychiatrist taken prisoner after the fall of Singapore and held from 1942 to 1945, where he watched fellow inmates swing between mania and normality and formed the hypothesis that some chemical was building up in their brains and being urinated out. After the war he injected guinea pigs with urine from manic and non-manic patients, found the manic urine more toxic, and narrowed in on uric acid over urea. Because uric acid wouldn't go into solution, he used lithium to dilute it — and the resulting lithium urate calmed the animals. Being a good scientist, he ran the control, injected lithium alone, and the guinea pigs calmed anyway. He moved to human patients with 1940s speed and published 'Lithium Salts and the Treatment of Psychotic Excitement' in the Medical Journal of Australia on September 3rd, 1949. Lithium carries real toxicity and needs careful blood monitoring, particularly in the first three months, but it suppresses inflammation in neural tissue and is neuroprotective against excitotoxicity — the process by which brain circuits that stay too active too long start killing their own neurons via calcium and glutamate. That matters because people with bipolar disorder show progressively diminished interoception into the second and third decades of the illness, which may be why they can't register that they're talking too fast or haven't slept in five days.

On everything else, Huberman is deliberately restrictive. Drug therapy works best alongside talk therapy — cognitive behavioural therapy has the most evidence, and interpersonal and social rhythm therapy is the emerging approach that treats the patient as embedded in other people's lives rather than as one isolated nervous system — but talk therapy alone is rarely effective. Electroconvulsive therapy shows real promise for treatment-resistant depression, though it doesn't touch the manic side, requires anaesthesia and hospital care, costs a lot, and carries memory loss. Of the supplements, he covers inositol (which he takes himself at 900 mg every third night, for sleep rather than mood) and omega-3s, citing a double-blind study in which 9.6 grams of fish oil per day for four months substantially reduced symptoms against an olive-oil control — while noting it ran in only 30 subjects. His repeated warning is that none of this is a substitute for a board-certified psychiatrist.

He ends on the creativity question, using a dataset compiled from the biographies of more than a thousand 20th-century Westerners. Military personnel, professional athletes and natural and social scientists sat at the low end for depression and mania; poets sat at the extreme, with as many as 90% showing one or the other, and about 30% of the actors studied showing mania. Huberman flags the association as correlative, not causal, and closes by repeating that anyone who suspects bipolar disorder in themselves or someone else should see a qualified professional.