Optimize & Control Your Brain Chemistry to Improve Health & Performance
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- ~6 min
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- 11 Jul 2022
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- 2:09:00
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KEYPOINTS
- 01
Each sleep stage runs its own metabolism
Huberman opens with a Cell Reports study (first author Nora Nowak) that measured nearly 2,000 breath metabolites every 10 seconds through the night. Sleep states regulated more than half of them. The switch from sleep to waking lowered fatty-acid oxidation, slow-wave sleep raised it, and REM transitions shifted TCA-cycle intermediates. His takeaway is that full-length sleep, with slow-wave sleep early in the night and REM late, may tune daytime metabolism. Losing even an hour mostly cuts REM, which he says affects emotional stability and glucose metabolism.
- 02
Four neuromodulators set your brain state
Dopamine (motivation), epinephrine (alertness), acetylcholine (focus) and serotonin (well-being and satiety) change the likelihood that whole circuits fire. Their fast actions last seconds to about an hour, and their slow actions last hours to weeks, setting the baseline any tool works against.
- 03
The day has three neurochemical phases
In Huberman's framework, phase one (roughly 0 to 9 hours after waking) is when dopamine and epinephrine are at their highest. Phase two (about 9 to 16 hours) sees them fall while serotonin rises. Phase three (about 17 to 24 hours) should be sleep, with large organized swings in dopamine, serotonin and acetylcholine and little epinephrine. So a small push raises motivation in the morning, while getting focused at 9 pm takes stronger or combined tools.
- 04
Hormones tend to travel with particular neuromodulators
Painting broadly, Huberman says testosterone and dopamine tend to rise together in both sexes. Cortisol pairs with epinephrine, and oxytocin and prolactin pair with serotonin. Acetylcholine has no clear hormonal partner.
- 05
Morning sunlight and steady caffeine raise dopamine's effect
Early-day light to the eyes triggers dopamine release and, per a study he cites, increases expression of the DRD4 dopamine receptor gene. Regular moderate caffeine, about 100 to 400 mg a day, increases D2 and D3 dopamine receptors, separate from its immediate effects on alertness. Huberman cuts caffeine off around 2 pm and certainly by 4 pm, because it disrupts sleep architecture even when you can fall asleep.
- 06
Bright light at night suppresses dopamine
Citing Samer Hattar at the NIMH, Huberman says bright light of any color during phase three (roughly 10 pm to 4 am for a typical sleeper) activates a circuit involving the habenula that lowers dopamine. The effect isn't limited to melatonin, and it can carry into the next day. Keep middle-of-the-night lighting dim or off.
- 07
Movement, breathwork and cold release epinephrine
The locus coeruleus releases epinephrine across the brain, separately from the adrenals, and is tied to action in both directions: moving raises it, and its activity makes you want to move. Any exercise early in the day boosts energy for hours. Huberman suggests delaying caffeine 90 to 120 minutes after waking to blunt the afternoon crash. Cyclic hyperventilation (about 25 deep breaths, a brief breath-hold with lungs empty, repeated) reliably raises adrenaline, but people prone to anxiety or panic should be cautious.
- 08
Acetylcholine marks circuits for plasticity
Acetylcholine from the nucleus basalis highlights active synapses for later strengthening, and release from sites at the back of the brain filters which sensory signals reach awareness. He cites work from the labs of Michael Silver, Michael Merzenich and Michael Kilgard showing that raising acetylcholine before and during learning makes changes more likely to stick.
- 09
Serotonin's strongest behavioral levers are touch and gratitude
Physical contact with loved ones, including hugs, hand-holding, cuddling and petting a dog, increases serotonin transmission. On gratitude, Huberman says receiving it, and even watching others give and receive it, activates serotonergic circuits more than giving it. He calls these power tools rather than soft advice.
EXAMPLES
- 01
The 2019 night-owl reset trial
A randomized trial in Sleep Medicine had night owls wake and sleep 2 to 3 hours earlier, fixed within 15 to 30 minutes every day including weekends. They maximized outdoor light before noon, dimmed evening light, kept meal times consistent, had no caffeine after 3 pm, took no naps after 4 pm or longer than 90 minutes, and exercised in the morning. Participants reported less depression and stress and showed better reaction times and grip strength.
- 02
Cold water and sustained dopamine
Huberman cites the 2000 Šrámek study, in which sitting neck-deep in 60°F water for up to two hours produced long-lasting increases in dopamine and other catecholamines. He says later work suggests colder water (about 45 to 55°F) for as little as 30 seconds to a few minutes may also work. His guide is cold enough to be uncomfortable but safe, for 1 to 10 minutes, and ice isn't required. He notes Anna Lembke's patient who used cold exposure while coming off addictive drugs.
- 03
The cheese effect
Tyrosine-rich foods such as some meats and Parmesan support dopamine synthesis. People taking MAO inhibitor antidepressants who eat aged cheeses rich in tyramine can get migraines and spikes in blood pressure. Huberman uses it to show why anyone on dopamine-related medication should be careful.
- 04
Alpha-GPC, TMAO and garlic
Huberman takes 300 mg of alpha-GPC before training or work three to four times a week, often with caffeine and phenylethylamine. He notes that a few studies link long-term heavy use to higher stroke risk and says the data are still out. His blood work showed a rise in TMAO, and on a tip from Dr. Kyle Gillett, 600 mg of garlic (allicin) brought it back down.
- 05
5-HTP versus myo-inositol
Huberman tried 5-HTP (people commonly take 300 to 500 mg) before bed twice. Each time he slept deeply for 1 to 3 hours, then woke and couldn't get back to sleep, so he dropped it. In contrast, 900 mg of myo-inositol 30 to 60 minutes before bed, taken every third night or so, has noticeably deepened his sleep and made it easier to fall back asleep. He contrasts that with the 5 to 18 g daily doses in human anxiety studies, where gut discomfort causes dropouts.
OTHER RELEVANT
- 01
Order of operations
Huberman's rule is behavior first, then nutrition, then supplements, then prescription drugs if there's a clinical need, under a physician. Don't throw every tool at a system at once. Keep a kit and use what fits the time of day and your goal. Talk to a doctor before changing supplements, especially if you take medication for depression or mania.
- 02
Dopamine supplements: how he uses them and what he avoids
He avoids Mucuna pruriens, which he describes as about 99% L-DOPA, because it causes a sharp crash afterwards. He uses L-tyrosine at most about once a week at 500 to 1,000 mg; it acts within 15 to 45 minutes and lasts roughly 30 minutes to two hours. Phenylethylamine at 300 to 600 mg is faster acting. He stresses that sensitivity varies widely. B6 can lower prolactin, but excess has been linked to peripheral neuropathy.
- 03
Simple focus and food tools
Stare at a visual target at your working distance for 30 to 60 seconds before a work session to narrow your attention. Choline sources include beef liver, eggs, beef, soy, chicken, fish, mushrooms and kidney beans. Tryptophan sources include turkey, whole milk, canned tuna, oats, cheddar, nuts, seeds and chocolate. He notes that post-feast sleepiness is mostly from overeating, not tryptophan.
- 04
Serotonin supplements need caution
Cissus quadrangularis at 300 to 600 mg increased serotonin by roughly 30 to 39% in an obesity study. Huberman says it may need cycling, and there's little good data on how. With anything serotonergic, watch for reduced appetite or libido, and never use supplements to replace prescribed SSRIs without your physician.