Dr. John Kruse — An MD-PhD psychiatrist who specializes in treating ADHD in children and adults, with a research background in circadian biology. He is writing a book titled 'Attention Deficit World.'
The gist
Andrew Huberman and Dr. John Kruse cover what ADHD actually is, why it persists into adulthood, and why modern life (social media, remote work) is making everyone more distractible. Kruse lays out four behavioral foundations that come before medication: sleep, eating, exercise, and relaxation, emphasizing that the timing of sleep matters as much as duration. They then work through the full pharmacology of focus, comparing amphetamine products, methylphenidate, modafinil, guanfacine, and non-stimulants, while weighing risks like amphetamine-induced psychosis and cardiac effects. The conversation also explores caffeine, nicotine, cannabis, fish oil, the gut microbiome, time perception, and the idea that ADHD may stem from a misregulated circadian rhythm.
Big reveals
- Kruse claims a child with ADHD has a life expectancy about 10 years shorter than non-ADHD peers, driven mostly by accidents and suicide.
- He argues suicide fell during COVID lockdowns because impulsive at-risk people were never alone enough to act on the impulse.
- Amphetamine-induced psychosis hits roughly 1 in 500, and about 20% of those people remain permanently psychotic 20 years out.
- In his San Francisco practice his psychosis rate exceeded 1 in 100, and patients hospitalized for it still begged to get back on the drug.
- Kruse breaks with most ADHD experts, arguing Ritalin (methylphenidate) is not a 'full stimulant' like amphetamine.
- Counterintuitively, putting kids with real ADHD on stimulants normalizes their otherwise doubled (~40%) addiction risk.
- He cites a view that ADHD is primarily a circadian-rhythm disruption, with morning bright-light therapy measurably improving symptoms.
Things worth remembering
- ADHD heritability is around 0.8, comparable to height or schizophrenia.
- Kruse found the only patients who showed up at the wrong (front) door of his office were the ones with ADHD.
- Sleep timing matters as much as duration; eight hours slept at the wrong time are less restorative.
- People with ADHD have a strong, genetically influenced tendency to be night owls.
- A University of Florida study found the same Starbucks drink varied threefold in caffeine across days.
- Nicotine is unusual in that it can both arouse and reduce anxiety at the same time.
- A Harvard fish-oil-for-mania study (up to 7,000 mg/day) was stopped early because benefits were so strong.
- Kruse argues against EPA-only fish oil, favoring the natural ~2:1 EPA-to-DHA ratio since the brain is rich in DHA.
- Vyvanse was engineered to resist abuse: it stays inactive until red-blood-cell enzymes slowly cleave off a lysine molecule.
- Kruse was discussing the gut microbiome and ADHD nearly 20 years ago, long before it became mainstream.
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Attention Deficit World
Dr. John Kruse
“we are all becoming more ADHD like so that that's the thesis of the book that I've been working on ... I call it attention deficit world” — Dr. John Kruse 00:21:57Find it on Amazon