Your Brain On
A podcast about the neuroscience of everything. From neurologists, researchers, and public health advocates Drs. Ayesha and Dean Sherzai, explore every aspect of our world through a neuroscientific lens, with science-based stories, interviews, anecdotes, and brain health facts. Equip yourself with neurologically sound answers to life's everyday health questions and learn the essentials of brain health and optimization, one topic at a time.
Episodes
Your Brain On... Memory Testing
The neurologist who built the test that was used on the President of the United States explains what memory tests actually tell you, and why even a perfect score isn't the whole picture. We sit down with Dr. Ziad Nasreddine, the neurologist who created the Montreal Cognitive Assessment (MoCA), to look at how memory is actually measured, why a score can be shaped by your education and how comfortab
Your Brain On... Friendship
We're more connected than ever, yet, we've never been lonelier. We sit down with neuroscientist Dr. Ben Rein, author of Why Brains Need Friends, to look at what isolation does to the brain and body, why we badly underestimate our own social skills, and how to build real connection back into ordinary life. The conversation opens 45,000 years ago, with a healed bone that points to one of the earlies
Your Brain On... the MIND Diet
Researchers found people who ate these 9 foods consistently had brains that aged 7.5 years slower. Not a supplement stack, not a protocol, not a hack. A pattern of real food that keeps showing up across decades and across the world. It's called the MIND diet, and it's what we're breaking down in this episode. We explore the scoring system behind the MIND diet with a registered dietician who came t
Your Brain On... Insomnia
It's 3 AM and your brain won't shut off. About 1 in 10 adults meets the clinical definition of chronic insomnia, and most never get treated. Instead, they scroll through an endless aisle of magnesium gummies, melatonin, and $300 trackers that don't address the real problem. We brought in a neurologist and a psychologist who never spoke to each other and landed on almost the exact same conclusions.
Your Brain On... Microplastics
Headlines warned us about microplastics in our brains. A chemist says the study may have been measuring brain fat instead. In 2025, a study claiming microplastics accumulate in human brain tissue dominated our feeds. We covered it. Then Dr. Michelle Wong, a chemical scientist and science communicator, flagged a problem with the methodology. So we went to the primary literature, read the critique,
Your Brain On... Menopause Hormone Therapy
Menopause hormone therapy and your brain: what the evidence says vs. what the algorithm is selling you. Two-thirds of Alzheimer's patients are women. That statistic has fueled a social media narrative that hormone therapy can prevent dementia, but the current evidence doesn't support that claim. In this episode, Drs. Ayesha and Dean Sherzai sit down with OBGYN Dr. Jen Gunter and neuroscientist D
Your Brain On... Vascular Dementia
Most people think dementia starts with memory loss. But for millions, it actually begins decades earlier: in the blood vessels. Long before someone forgets a name or misses an appointment, the brain is being quietly damaged by high blood pressure, cholesterol imbalance, poor sleep, inflammation, and chronic stress, day after day, year after year. This kind of damage doesn't look dramatic. There's
Your Brain On... Cold Plunges
Cold plunges are everywhere, and the way people talk about them, you'd think they're a miracle cure for your brain, body, and soul. But in an age of algorithm-fueled evangelism, when a ritual becomes this ubiquitous and loud, we have to ask: how much of the buzz is backed by science… and how much is just marketing? In this episode, we explore the neuroscience of cold exposure: what's real, what's
Your Brain On... Cheese
Around the start of 2026, a study sparked viral headlines claiming that cheese could reduce dementia risk. But... nutrition science almost never works like this. One study can't "prove" a food is protective or harmful, and viral health claims often miss the most important details of research: how the data was gathered, what was actually measured, what variables were controlled for, and what it mea
Your Brain On... Chemotherapy
Chemotherapy saves lives. But for millions, it also comes with side effects of cognitive fog, memory lapses, slowed thinking, and emotional flattening. In the past, 'chemo brain' has sometimes been dismissed as anecdotal. But, as science has evolved, we've come to understand the very real shifts in attention, memory, processing speed, and emotional regulation underpinning the impairment. In this e
Your Brain On... Parkinson's (2025)
From 18th century London to the promise of a global cure: the 200-year history of Parkinson's disease. To mark the release of our 'Ask the MD' conversation with The Michael J. Fox Foundation for Parkinson's Research, and to welcome a new influx of listeners, we're sharing one of our very first episodes, first aired in August 2024. Watch our full 'Ask the MD' interview, focused on lifestyle strateg
Your Brain On... Eating Meat
Carnivorous diets have been woven into our history for millennia, but, with nutrition science advancing at an unprecedented pace over the past century... do we really still need to be eating meat? We live in a time of rising chronic disease, new longevity research, and a growing awareness of how our food choices shape our brain and our planet. We're also constantly exposed to 'nutrition tribalism'
Your Brain On... Nutrition (with Dr. Walter Willett)
Everyone eats. It's the one thing we all have in common. And yet, nutrition has become one of the most confusing, divisive, and misunderstood sciences in modern life. Low-fat. High-fat. Keto. Vegan. Paleo. Superfoods. For every study, there's a headline that seems to say the opposite. In this episode, we turn to one of the most trusted voices in nutrition research to cut through the noise: Dr. Wal
Your Brain On... Autism
Autism isn't new, but our understanding of it has changed dramatically. It's now recognized as a broad neurodevelopmental spectrum that shapes how millions of people perceive, process, and interact with the world. In this episode, we explore what autism is AND isn't, from its earliest signs in infancy to its deep genetic roots, and why misinformation about it continues to spread. We speak with thr
Your Brain On... Diabetes
Behind the staggering statistics on global diabetes prevalence are millions of individuals with different stories, struggles, and solutions. In this episode, we explore how diabetes affects your brain, body, and cognition, and how it can be prevented, managed, and (in many cases) reversed. We share some powerful personal stories from the clinic, bust some persistent food myths, and learn why diabe
Your Brain On... Alzheimer's (Mythbusting Special)
Alzheimer's disease is constantly surrounded by myths and misinformation. Let's set the record straight. In this episode, we bust through the most persistent Alzheimer's myths, with facts based on decades of clinical experience and cutting-edge research. Myths include: • "Alzheimer's is inevitable in old age" • "It's all genetic, and there's nothing you can do" • "There's no cure, so diagnosis is
Your Brain On... Purpose (Sherzai Family Special)
With big changes happening in the Sherzai family household, we sat down for a roundtable discussion about the concept that will shape what we're all doing next: our purpose. In this 'unplugged' mid-season chat, we're joined by our kids — Sophia and Alex! — for a wide-ranging conversation about our values and goals. How they form, how they falter, and how they evolve, in an increasingly noisy world
Your Brain On... Creatine
Creatine for Alzheimer's — let's separate the hype from the hope. A new study has caused a stir in June 2025, but lead researcher Matthew K. Taylor told us: " I don't think I can recommend it to a patient that this is going to ultimately have some sort of cognitive influence." We speak to Dr. Taylor and Dr. Russell Swerdlow in this episode, discussing: • Role of creatine in your brain, and why it
Your Brain On... Stress
Stress isn't just a threat to your brain. It's also one of its best tools for growth. We often hear that stress is bad for your brain. And it can be. Chronic, unpredictable, and uncontrollable stress can damage cognition, harm memory, and accelerate aging. But we don't talk enough about how the right kind of stress can actually improve brain function, grow your hippocampus, and help you feel happi
Your Brain On... Stroke
Stroke is one of the biggest causes of death in the world — but also one of the most preventable. Up to 80–90% of strokes could be avoided with more awareness, resources, and a firmer focus on prevention over intervention. In this episode, we're joined by renowned stroke neurologist and public health pioneer Dr. Olajide Williams, MD, MS, whose 'Hip-Hop Stroke' movement is a shining example of enac
Your Brain On... The Food Industry
How can we eat better when we're constantly marketed to in a way that hijacks our attention and habits? To complement the incredible discussions we regularly have about brain-healthy nutrition, in this episode, we've having a very important conversation about how the food industry works against our best intentions, and how we can break through the psychological barriers they use to hold us back. W
Your Brain On... Lyme Disease
A tiny bite from a tiny tick can trigger a complex disease which speaks to some huge problems with our healthcare system. In this episode, we explain the biology, controversy, and cultural blind spots around Lyme disease, a condition that reflects much more than just a bacterial infection. It's also a mirror for our most urgent public health issues: inequality, misinformation, climate change, and
Your Brain On... Brain-Computer Interfaces
Restoring a person's ability to speak, enabling individuals with paralysis to regain movement, and detecting neurodegenerative diseases earlier than ever — these are just some of the breakthroughs brain-computer interfaces are making possible. In this episode, we explore the astonishing world of BCIs: technologies that are giving autonomy and independence back to people with diseases like ALS. We
Your Brain On... Gluten
Gluten has become one of the most misunderstood aspects of modern nutrition. Let's set the record straight. In this episode, we untangle the medical, neurological, and cultural narratives surrounding gluten, from celiac disease and non-celiac gluten sensitivity to real (and rare) cases of gluten-induced brain dysfunction. We discuss: • The differences between celiac disease, gluten sensitivity, an
Your Brain On... Menopause
Two-thirds of those diagnosed with Alzheimer's disease are women — but why? In this episode, we unpack the neurological, hormonal, and social drivers that uniquely affect women's brain health during the menopausal transition — from estrogen's protective role in the brain to the misunderstood history of hormone replacement therapy. We discuss: • Why women face a higher risk of Alzheimer's than men
Your Brain On... Music
Music is one of the most powerful forces of all time for human connection, cognitive stimulation, and therapeutic introspection. We've seen music help Alzheimer's patients find their voice, children with speech disorders unlock new ways to communicate with rhythm and melody, and communities express their identity through song. In this episode, we discuss: • The cognitive, psychological, and mental
Your Brain On... Supplements
Supplements have become a hundred-billion dollar industry. But can they really boost your brain health in the ways they claim? They're everywhere: shelves and shelves of pills and powders promising everything from improved immunity, boosted energy, and faster weight loss to better sleep, happier moods, and enhanced sexual wellness. Social media influencers won't stop talking about them, and they
Your Brain On... Traumatic Brain Injury
Traumatic Brain Injury is a major cause of death, disability, and cognitive decline. Thankfully, evolving research is helping us protect our heads and lessen the long-term impacts of TBIs. In this episode of 'Your Brain On...' we discuss: • The effects and symptoms of TBI, from mild concussions to more severe head injuries • What actually happens to your brain when you sustain a TBI • The links be
Your Brain On... Omega-3
Omega-3 supplements have become a multi-billion-dollar industry, promising to enhance your memory, boost your mood, and protect your brain. But where does the science end, and the marketing hype begin? Omega-3 fatty acids are a special category of 'good fats' that play vital roles in both brain and body health. Unlike some species, we can't produce our own Omega-3s, so we must rely on our diets to
Your Brain On... Social Media
Two decades on from the start of the smartphone revolution, we have the first humans who, for as long as they've been alive, have had the entire internet just a few taps away. What has this done to our brains? It's been an unprecedented period of rapid change, and, with the largest social networking sites using every neurological trick in the book to keep us endlessly scrolling down our feeds, wha
Your Brain On... (Sherzai Family Holiday Special)
Our incredible kids Sophia and Alex Sherzai join us for a special end-of-year episode of the 'Your Brain On...' episode! As a family of neuroscientists — Sophia in biomedical engineering, Alex in artificial intelligence, Ayesha in vascular neurology, and Dean in behavioral neurology — we have fascinating discussions (and debates) about all aspects of life and brain health almost every day. To clos
Your Brain On... Ketogenic Diets
High in fats and low in carbs, ketogenic diets were originally developed in the 1920s to treat children with epilepsy. Now, they've gained popularity for weight loss, and even improved cognitive function. But how much truth is there in the purported brain health benefits we see on social media? In this episode of 'Your Brain On...', we separate the facts from the fads, and discuss: • What one migh
Your Brain On... ALS
ALS, a nervous system disease, ruled the headlines in the summer of 2014 thanks to the viral Ice Bucket Challenge. How has our knowledge of the disorder evolved a decade later? Amyotrophic lateral sclerosis, also known as 'Lou Gehrig's disease' (named after the iconic baseball player), is a progressive neurological disorder which breaks down a person's motor neurons. The main symptoms are muscle w
Your Brain On... Ketamine
For decades, ketamine has mainly been used as an anaesthetic, but in more recent years, it's gained popularity in mental health treatment. Conversations around the benefits and risks associated with its therapeutic usage ignited towards the end of 2023, when actor Matthew Perry, star of the sitcom 'Friends', died from the acute effects of the ketamine he was using to treat anxiety. In this episode
Your Brain On... Sex
From the first spark of attraction, all the way to climax, sex sets off chemical fireworks in your brain. And yet, this beautiful, powerful act has become mired in shame and stigma. But through open conversation and deeper scientific understanding, we can cast off those shackles, and even embrace sex as a marker for cognitive and overall health. In this episode of 'Your Brain On...' — our Season 4
Your Brain On... Protein
Protein — how much do we need? What's the healthiest way to consume it? Can we get enough from plant-based diets? Until recent decades, protein hasn't been quite as prominent in public health discussions as sugar and fats. However, with longer lifespans emphasizing the importance of protein for long-term health, and growing confusion around the quality and quantity of protein needed, it has becom
Your Brain On... Misinformation
The digital age has made it easier than ever to access health information, but how can we know which sources to trust? Social media is saturated with misinformation. Some of it is inadvertent — many bold pseudoscientific claims seem very convincing, and anyone could be forgiven for sharing it with the best intentions. But, a more deliberate manipulation of scientific information has become commonp
Your Brain On: A Brain Health Revolution Summit Special
20 incredible conversations with leading scientists, in one hour. We're excited to present this special installment of Your Brain On, featuring highlights from some of the speakers talking at our first ever Brain Health Revolution Summit. Our first summit, running September 30 through October 6 2024, features seven days of hour-long discussions with the scientists who are actually conducting the s
Your Brain On... Having A Pet
What are our animal companions thinking? And how does our friendship with them change their brains, and our brains? We all wish we could communicate with our pets. Though we may never share a language, modern neuroscience has enabled us to ethically understand the cognitive anatomy and emotional signals of other animals like never before. In this episode of 'Your Brain On...', we discuss what we'v
Your Brain On... Coffee
What does the most-purchased beverage in the world — coffee — do to your brain? Five centuries after its discovery, coffee is deeply entrenched in our diets on a global scale. More than half the U.S. population drinks coffee daily. We wake up with coffee, and catch up with friends over coffee. Historically, coffee has been heralded as an inspiring muse. But many headlines have warned us about the
Your Brain On... Grief
What grief does to our brains, and how we can grow from one of life's most challenging experiences. The impact grief has on your mind can be so severe, some experts refer to it as an 'emotional traumatic brain injury'. And, like many life-altering physical changes, the cognitive effects of grief aren't so much something to 'get over' — rather, they're something we can learn to live with and thrive
Your Brain On... Caregiving
As populations have aged, our need for caregivers has risen fast. The stresses of caregiving present brain health concerns that we must address urgently. Caregivers are heroes. But they're often so focused on looking after someone else, they neglect themselves. And self-care is so vital for caregivers, because the role is one of the most physically-, emotionally-, and psychologically-demanding res
Your Brain On... Meditation
Meditation: an ancient practice with brain health benefits proven by modern science. Whether you're focusing on your breathing to quieten peripheral distractions or using mindfulness to rebalance your emotional reactivity to everyday stresses, practicing meditation can spark long-term neuroplastic changes that will help you feel more attentive and calm in everything you do. In 'Your Brain On... Me
Your Brain On... Leg Strength
Leg strength isn't just about physical health. There are enormous benefits for brain health, too. From the more obvious benefits for balance and mobility to the deeper neurochemical machinery that powers the production and transportation of brain-boosting proteins, leg strength has a far greater influence on brain health than we might expect. In this episode of 'Your Brain On...', we discuss: • Th
Your Brain On... Marijuana
The neuroscience behind the benefits and risks of marijuana, explained. Splintered legislature, evolving taboos, and new forms of consumption have created a fragmented market for cannabis, and made it challenging for scientists to research its effects on our brains and bodies. In this episode, we unpack what we know about the cognitive impacts of marijuana use — the good and the bad — and explore
Your Brain On... Parkinson's
From 18th century London to the promise of a global cure: the 200-year history of Parkinson's disease. Parkinson's, a neurodegenerative disorder most commonly characterized by tremors and other motor symptoms, is so complex, many medical professionals are starting to classify it as a group of diseases, rather than a single disease. In this episode, we explain those complexities, including: • The m
Your Brain On... Ozempic
Ozempic. Developed as diabetes medication. Adopted as a weight loss drug. Eyed for its potential neuroprotective effects. Hollywood's popularization of Ozempic as a way to lose weight has made it one of the most widely-discussed drugs of our time, and has put immense stress on supply chains, sometimes preventing its intended users — type-2 diabetics — from accessing the medication. In this episode
Your Brain On... Retirement
Retirement, often considered a period of late-life decline, can actually be a time of cognitive growth and prosperity. When we retire, all the neurologically stimulating aspects of our working life — the mental and physical challenges, socializing and strategizing with colleagues, etc. — can disappear overnight. An abrupt lifestyle change of this magnitude can be taxing for our brains, but with th
Your Brain On... Introversion
Do introverts/extroverts have different brains? Are you born introverted? Is introversion neurologically harmful? The definition of introversion has been blurred in the social media age. We all know introverts are more likely to enjoy alone time, and may find social settings more challenging, but what's less clear is: why? And is introversion the same as social anxiety? In this episode, we discuss
Your Brain On... Sleep
We spend a third of our lives sleeping. The benefits for our brain are incredible. Restorative sleep is essential for good brain health. When you sleep, your brain washes away waste products from around your synapses, consolidates short-term memories into long-term knowledge, and processes thoughts and emotions. In this episode, we explain how, and discuss: • How much sleep your brain really needs
Your Brain On... Virtual Reality
VR headsets allow us to step into vast virtual worlds. What does that mean for our brains? Virtual reality technology is the most advanced and affordable it's ever been, and the tools to create immersive environments are just a few clicks away. Are we destined for a dystopian future, lost in computer-generated isolation? On the contrary, VR devices have been put to good use in clinical settings fo
Your Brain On... Sunlight
Sunlight has kept our brains on a 24-hour schedule for hundreds of thousands of years. Here's how. When sunlight touches your skin or hits your eyes, your brain ups the production of serotonin, to make you feel alert. And when night falls, your brain switches to releasing melatonin, so you know it's time to sleep. So when we don't get enough sunlight, our biological cycles can start to break. In t
Your Brain On... Fats
Fat can have a bad reputation, but certain fats are essential for the healthy functioning of your brain. Between government guidelines, fad diets, and our endless social feeds, nutrition advice overload has left us all a bit lost with how to incorporate healthy fats into what we eat. In this episode, we discuss: • The different kinds of fats (saturated vs. unsaturated) and which ones we actually n
Your Brain On... Hearing Loss
How does hearing loss change the brain and contribute to cognitive decline? The human capacity to hear is incredible. In milliseconds, sound vibrations are transformed into mechanical energy, then sensorineural signals, and then, in our brains, a universe of meaning and memory. When that sense begins to fade, either due to aging or because of causative damage, our brains can become understimulated
Your Brain On... Comedy
Laughter predates language. But what's the neurological function of humor? Why do we find things funny? Your brain's ability to perceive and create comedic ideas is one of the most powerful facets of the human experience. Through humor and laughter, we can find shared understanding across the boundaries of cultures, languages, and ideologies. In this episode of 'YOUR BRAIN ON...', we discuss: • Wh
Your Brain On... Space Travel
Space travel goes against a million years of human evolution. So how does it affect our brains? In just six decades of manned space flights, we've discovered a remarkable amount about the neurological effects of venturing to the stars. In this episode of 'YOUR BRAIN ON...' we discuss: • How low gravity changes your brain structure, impacts your balance, and... actually might improve your sleep • T
Your Brain On... Presidential Aging
The U.S. is set to have its oldest President ever. Should we be worried, or are we thinking about aging the wrong way? The unprecedented age of the two United States presidential candidates, Biden and Trump, has sparked fiery debates over whether a leader can be 'too old' to effectively run a country. Our guest for this episode, neuroscientist Dr. Charan Ranganath, recently published a New York Ti
Your Brain On... Cardio
A healthier heart equals a healthier brain — no surprise there — but what's the neuroscience behind the benefits of a cardio workout? Cardiovascular exercise, be it a brisk stroll, a light jog, or an intense interval training session, releases neurotransmitters that can improve your mood, reduce stress, enhance your memory, and strengthen immunity. In this episode of 'Your Brain On', we discuss: •
Your Brain On... Alzheimer's
How does Alzheimer's alter the brain, and how do we create a future without the disease? Alzheimer's, the most common form of dementia, threatens to single-handedly collapse our healthcare systems. But our knowledge of how to prevent it is stronger than ever. In this episode of 'YOUR BRAIN ON', we discuss: • The power of stories and the importance of community for finding comfort and confidence fo
Your Brain On... Being A Woman
Are there differences between the brains of women and men? In this episode of Your Brain On, we explore the unique aspects of the female brain, and how the male-biased history of medical science has left us with enormous gaps in our knowledge of women's distinctive neurology. We discuss: • The striking uniformity in the structure of the female and male brain • The possible physiological and sociol
Your Brain On... ADHD
What actually is ADHD? What caused the sharp increase in cases? How does diagnosis work? ADHD. Attention Deficit Hyperactivity Disorder. 60 years ago, it wasn't mentioned at all in the Diagnostic and Statistical Manual of Mental Disorders. Now, it's one of the most broadly-discussed disorders in the world. In this episode of 'Your Brain On', we discuss: • What's distinct about the brains of peop
Your Brain On... Lobotomies
From trepanning to Neuralink, we've always been curious about operating on our brains — for better or worse. Tens of thousands of people were lobotomized before the practice began to decline in the 1950s. The era of lobotomies is one of the darkest chapters in medical history. Many of the period's missteps can guide how we think about healthcare ethics today, and in the future. In this episode of
Your Brain On... Dreams
Why do we dream? Is lucid dreaming real? How can dreams be used for therapy? Does cheese really give us nightmares? In this episode, we discuss the neuroscience and psychology of: • REM sleep, and how it puts our brain in the ideal state for creating dreams • Why dreams might be a way for our brains to stop non-visual senses taking over our brains when we sleep • The links between recurring dreams
Your Brain On... Sugar
Sugar often carries a blanket negative health connotation. But our brains need carbohydrates for everyday energy. The term "sugar" is often used in a broad and imprecise manner, often encompassing a wide range of carbohydrates — without distinction. This oversimplification overlooks the nuanced roles and effects of different types of carbohydrates on our health. In this episode, we aim to dissect
Your Brain On... Football
When wins and losses shape the mood of entire cities, what's happening in the brains of football fans? In this episode, we discuss the neuroscience and psychology of: • Football fandom, and bonding with others over shared love of a team • The chemicals that make wins feel so joyous, and losses so painful • How our empathy systems transport us into the shoes of the players We explore the evolutiona
Your Brain On... Love
Neurochemically, what is love? How can neuroscience help us maintain long-term relationships? Is heartbreak real? In this episode, we discuss the neuroscience and psychology of: • Why falling in love can feel so stressful • How being infatuated activates the same neurotransmitters as having OCD • What happens to your brain when exciting new romances settle into comfortable decades-long unions We s
Your Brain On... Dry January
What happens to your brain when you stop drinking? Is doing Dry January the best way to quit? In this second preview episode of Your Brain On, we discuss the neuroscience and psychology of: • How alcohol affects your brain, at a cellular level • Why a gradual detoxification might be better than the hard stop encouraged by Dry January • The fascinating history of alcohol's role in culture, from a
Your Brain On... New Year's Resolutions
On New Year's Eve, we experience feelings of joy, sadness, thankfulness, regret, and nostalgia, as our brains recall episodic moments from the past 12 months. Surges of dopamine mix with our aspirations, forming resolutions. As we count down to the new year, we're full of excitement and hope. But most of us don't manage to stick to our new year's resolutions beyond January. In this episode of Your
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