LIVE EVENT Q&A: Dr. Andrew Huberman at the Chicago Theatre

This episode presents the question-and-answer session from a Huberman Lab live event held at the Chicago Theater in Chicago, Illinois. The evening began with a lecture titled The Brain-Body Contract, followed by audience questions. The stated reason for releasing the Q&A as an episode is that it should be available to everybody, not only those who attended in person.

Before the questions, the episode thanks the event's two sponsors, AG1 and Eight Sleep. Eight Sleep is described as making smart mattress covers with cooling, heating and sleep tracking. The pitch rests on a temperature claim: to fall and stay deeply asleep, body temperature has to drop by about one to three degrees, and to wake up refreshed it has to rise by about one to three degrees. The cover lets the user program temperature for the beginning, middle and end of the night, and it tracks rapid eye movement and slow wave sleep.

The endorsement is a personal one. The speaker reports sleeping on the cover for well over two years, and says they fall asleep far more quickly, wake far less often during the night, and wake feeling far more refreshed than before. The offer is $150 off the Pod 3 cover through eightsleep.com/huberman, with shipping to the USA, Canada, the UK, select EU countries and Australia.

AG1 is described as an all-in-one vitamin, mineral and probiotic drink. The speaker says they have taken it since 2012 and still drink it once or twice a day, framing it as insurance for foundational vitamins, minerals, probiotics and fiber. The offer through drinkag1.com/huberman is five free travel packs plus a year's supply of vitamin D3K2. These are sponsor claims rather than evidence presented in the Q&A itself.

I turn 70 soon. What is your best advice to keep my brain healthy in old age?

The answer starts by declining to give special advice for older age. The same guidance applies to anyone: the things that improve cardiovascular health and the perfusion of body tissues will also improve brain function. The reasoning is that the brain is a heavy consumer of fuel, so it depends on capillaries, micro capillaries and arteries being clean and clear enough to deliver that fuel. The speaker calls this "the big one."

The concrete prescription, which the speaker credits to a friend named in the transcript as Peter Atiyah and calls "generally accepted," is about 150 and possibly as much as 200 minutes per week of so-called zone two cardio. Zone two is defined here as movement at an intensity where you can just barely carry on a conversation.

A less discussed point follows: load-bearing exercise of some kind is likely better, with two conditions. Your body has to tolerate it, and you should choose something you can keep doing over long durations without getting injured. The case for load comes from research suggesting load-bearing movement triggers the release of hormones from bone that cross the blood-brain barrier and may influence the health of neurons in areas such as the hippocampus. The speaker flags the limits plainly. This extends preclinical animal data to humans, though "there's some human data starting to emerge" in support.

Strength gets its own line of evidence. The speaker cites a paper, described as having come out that day or the day before, from Dr. Andy Galpin's lab and collaborators, which reports that cognitive health is highly correlated with measures related to strength. The speaker is careful about what this does and does not mean. It is not a case for doing only strength training. Instead, the claim is that all people should do some resistance training two or three times per week.

Two markers of how well the brain controls the periphery come up. The first is grip strength, along with growing asymmetry in grip strength between the two hands, which is described as an indicator of deficits in brain-to-periphery control and as correlated with cognitive decline. The second is the feet: the speaker mentions data on feet becoming floppy or flaccid and on losing the ability to extend the toes.

Here the answer turns personal. The speaker describes wearing a toe spreader, saying the devices hurt and noting a history of breaking that foot several times. Getting better at spreading the toes is described as giving more stability in the feet and making it easier to run and move without pain. The speaker then ties this back to the nervous system. One of the first tests given to a newborn is scraping the bottom of the foot to check the Babinski reflex, a neural transmission reflex that is essentially a test of nervous system health.

The speaker hedges this carefully. There are "many, many correlates of dementia," and losing fine control of the extremities is described as just one of them. This is a correlation, not a claim that foot training prevents dementia. The summary of this part of the answer admits that strength and cardiovascular training are "kind of stereotyped answers" while still calling them the prime movers against cardiovascular and cerebrovascular disease.

The answer then adds what the speaker calls something "a little bit more edgy": data on drugs that increase acetylcholine transmission. The example is an anecdote. Years earlier, while visiting a Nobel Prize winner at Columbia, the speaker watched him chew at least five pieces of Nicorette gum during a short meeting. The speaker notes in passing that this is not something they recommend.

In the speaker's retelling, the scientist explained that he no longer smoked because he did not want lung cancer, but that he saw nicotine as protective against Parkinson's and Alzheimer's. His reasoning, as relayed, was that declines in neuromodulation, specifically dopamine and acetylcholine, correlate with cognitive decline. The speaker later names the scientist as Richard Axel.

The speaker separates the anecdote from any recommendation. They say they are not encouraging people to take nicotine and point to its downsides: higher blood pressure and vasoconstriction. Both work against the perfusion argument that opened the answer. Nicotine is framed only as "an interesting consideration," and emerging cholinergic and dopaminergic drugs, or other ways to raise acetylcholine and dopamine, are described as "certainly intriguing." No specific drugs or supporting studies are given.

How can I optimize sleep while working 24-hour shifts as a firefighter, 24 hours on, 48 hours off?

The answer first widens who the question applies to. It probably also covers new parents and anyone going through a stressful period with frequent micro-waking during the night. The starting point is blunt: based on "really good data," shift work is bad for us, because humans are a diurnal species, not a nocturnal one. That warning comes with explicit thanks to shift workers for keeping everyone safe and making the world go round, and the stated goal is keeping them healthy.