LIVE EVENT Q&A: Dr. Andrew Huberman at Plenary in Melbourne

The episode opens with Andrew Huberman introducing himself as a professor of neurobiology and ophthalmology at Stanford School of Medicine. He explains that the material comes from a live event called The Brain-Body Contract at the Plenary Theatre in Melbourne, Australia. The event included a lecture followed by an audience question-and-answer session. Only the Q&A portion is released here, so that people who could not attend can hear it.

Before the Q&A, the two event sponsors, 8Sleep and AG1, get promotional segments. The 8Sleep read describes smart mattress covers with cooling, heating and sleep tracking. It claims that body temperature has to drop by about one to three degrees to fall and stay deeply asleep, and rise by about one to three degrees to wake feeling refreshed. The speaker says he has slept on the cover for nearly three years and that it has dramatically improved his sleep. The offer is $150 off the Pod 3 cover, with shipping to the USA, Canada, the UK, select EU countries and Australia.

The AG1 read describes a vitamin, mineral and probiotic drink that also contains adaptogens and micronutrients. The speaker says he has taken it daily since 2012, once or twice a day. He gives his reasons as meeting his vitamin and mineral quotas and getting enough prebiotics and probiotics for gut health. He adds that he still aims to get most of his nutrition from whole foods, but says some micronutrients are hard to get from food, or at least in sufficient quantities. The offer is a year's supply of vitamin D3 and K2 plus five free travel packs.

An audience member says some listeners are in or approaching their 50s and want to do everything they can to prevent dementia. They ask whether there are further thoughts, protocols or research to focus on. The responder jokes about answering "for the next two and a half hours," then sets out a structure: start with established facts, move on to emerging findings, allow a little speculation, and avoid conjecture.

So let's start with ground truths, and then let's move to emerging.

The first established point is vascular. The responder says blood circulation is good for the brain, and perhaps the most important thing for it. Anything that is good for cardiovascular health is therefore good for brain health. He notes that this is not the only factor.

Blood circulation is good for the brain, perhaps most important for the brain.

The concrete protocol offered is zone two cardio. The responder mentions that Peter Attia talks about it a lot, and adds that none of them invented the idea. The target he gives is 150 minutes a week, "probably more like 180 to 200 minutes," and he acknowledges that some people get more and some less. Zone two is defined by effort, not by activity: running, swimming or, depending on fitness, walking, done at a pace where you can just barely hold a conversation. Any harder or faster and you would struggle to finish sentences. He uses himself as an example: talking on stage is not zone two, but jogging while trying to talk, to the point of getting a bit out of breath, would be.

On how it works, the explanation is hedged. Zone two "seems to" act on the release of growth factors such as brain-derived neurotrophic factor, and on cytokines. The responder admits immunologists may roll their eyes at calling these "anti-inflammatory," since inflammatory cytokines are involved too. More broadly, he says increasing blood flow in and through the brain seems to matter for brain health. As a biological illustration, he describes animal species that swim around for part of their lives and then attach to a rock, after which a good portion of their nervous system degenerates.

A key conceptual point in the answer is that neurodegeneration and dementia are "not necessarily the same thing," a distinction the responder says is rarely discussed. Age-related decline in memory, especially working memory, can be linked to reduced dopamine transmission in the brain rather than to neurons dying. He describes this as fewer neuromodulators like dopamine "being deployed as we get older."

Working memory is defined as the ability to hold a string of numbers or information for immediate goals, without passing it into longer-term memory. Because the decline is linked to catecholamines, the responder says anything that raises catecholamines is relevant. That could be pharmacology, but it doesn't have to be. He points to the podcast's dopamine regulation material, which lists zero-cost and very low-cost ways to raise catecholamines, and says these are known to improve working memory. He states a preference for modulating dopamine through healthy means where possible.

The responder predicts more use of selective pharmacology to offset age-related cognitive decline. He immediately disclaims any recommendation.

I'm not recommending anyone do drugs or take drugs, prescription or otherwise

Nicotine is the main example. The responder says that "believe it or not," even though it increases vasoconstriction and blood pressure, nicotine "can offset some of the age-related reductions" in dopaminergic and cholinergic (acetylcholine) transmission. The qualifications are explicit. Don't smoke, vape, dip or snuff. He is not even recommending nicotine patches. He sees "some use cases," but only if your physician knows and you are not getting into a dangerous blood pressure range. He also mentions choline donor supplements as a way to raise acetylcholine and dopamine.

He also notes that some people are starting to take modafinil and Adderall in older age. He corrects himself partway through: modafinil is not an amphetamine, but Adderall, Vyvanse and similar drugs are, and he says he is not recommending this. His overall forecast is that "a number of different cognitive enhancers" will be used to offset some age-related cognitive decline. He sums up the range of the answer as running from zone two cardio, through behavioral protocols that raise neuromodulators, to prescription drugs.

On reducing the risk of Alzheimer's and other dementias tied to neurodegeneration, the responder says that, currently, most of the advice is about what not to do. Don't hit your head too hard, and if you do, don't hit it hard again. He calls this the two-hit model. He mentions American football and rugby, a sport he says he doesn't fully understand, which leads to a lighthearted exchange with the crowd about naming a favorite Australian football team. He declines because it "feels really dangerous."

Returning to the point, he says head and brain injuries are usually discussed in terms of sport, but most occur in other settings, such as among construction workers and in car accidents.