You Can Get Smarter. Neuroscience Proves It.
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I want to start with something I hear almost every week, from patients, from students, from some of the most accomplished people I know.
“I’m just not as smart as other people.”
Sometimes it comes out directly, like that. More often it arrives dressed in other language. Someone describes a co-worker who always has the answer in the meeting. A sibling who seems to grasp ideas without effort. A friend who navigates social situations with a ease they can’t replicate. And beneath all of it, the same quiet conclusion: some people are just built differently. Some people got more of whatever “it” is.
Once, a teenage patient came to see me with her mother because she felt she would never be as smart as her older sister. She was getting A’s in every subject except math and physics. She loved drawing, writing, singing, and acting — she was the star of her school’s theater group — but in her mind, none of that counted. She couldn’t understand the equations. And in her world, that meant she wasn’t smart.
I want to tell you what I told her. And I want to explain the neuroscience behind it, because this is not a motivational speech. This is biology.
What Intelligence Actually Is
When we talk about the brain and higher-level thinking, we often confuse three words that mean very different things: cognitive skills, talents, and intelligence.
Cognitive skills are the higher brain functions you use every day — reading, writing, navigating a conversation, doing your taxes, following a recipe. Talents are cognitive skills that go one step further: playing a musical instrument, excelling at a sport, writing beautifully, creating visual art. And intelligence simply means doing any of these cognitive skills at an exceptionally high level.
Here is what neuroscience tells us about all three: they are the result of networks of neurons connecting and firing in two parts of your brain — the cortex and the hippocampus. The cortex is the outer layer of your brain, and the hippocampus is an extension of the cortex that sits deep inside your temporal lobe, roughly the size of your thumb. Together, they form the biological foundation for everything you think, learn, and remember.
And what is the most important thing I can tell you about those structures?
They are highly malleable. They can change. They change for the better every single time you use them. When you challenge them by doing something difficult — something genuinely unfamiliar and demanding — you make them grow larger and stronger. They are, in the most literal neurological sense, like your muscles. The more you challenge them, the larger and stronger they get.
There Are 30 Forms of Intelligence — Not Two
In my book, The Invincible Brain, I describe 30 different forms of intelligence. Not two. Not the handful that get tested on standardized exams. Thirty.
There is emotional intelligence — your ability to perceive and manage feelings in yourself and others. Social intelligence — your ability to connect with almost anyone in any room. There is body movement and dexterity intelligence. Musical intelligence. Cooking intelligence. Humor intelligence — yes, being a genuinely funny person is a form of intelligence, and a sophisticated one at that. There is navigational intelligence, digital intelligence, street-smart intelligence, happiness intelligence, and many more.
My point is not simply that the definition of intelligence is broader than we thought. My point is that the way we have been measuring and talking about intelligence — in schools, in workplaces, in the way we size each other up — has been systematically wrong. We have taken two or three narrow cognitive domains, elevated them above everything else, and allowed millions of people to walk away from childhood and adolescence believing they came up short.
My teenage patient had extraordinary intelligence for visual art, narrative writing, performance, and musical expression. Her cortex and hippocampus had grown and specialized to be exceptional in those areas. They had not, yet, been challenged enough in math and physics. But that was not a fixed condition. It was a starting point.
The Patient Who Scored in the 99th Percentile
After I explained to her the malleability of the cortex and hippocampus — that these structures change every time they are challenged, and that she could genuinely become excellent at math and physics if she committed to challenging them — something shifted.
She had been telling herself a story. A story that said: I am not the kind of person who is good at this. That story was not just discouraging. At a neurological level, it was an active obstacle, because it was removing the effort and practice that growth requires. Once she stopped believing the ceiling was fixed, she began working as though it wasn’t.
With some tutoring support and consistent daily practice, she improved steadily. And when she sat for her SAT exam, she scored in the 99th percentile — meaning she had performed exceptionally well across every dimension of that test, including the mathematical sections she had once believed were beyond her.
She had not discovered hidden talent she never knew was there. She had built it. That is what the brain does when you give it the right conditions.
Intelligence Is Not Fixed
I want to be as clear as possible on this point, because it runs counter to a very deep cultural assumption: intelligence is not fixed. Not at 16, not at 45, not at 70.
Every part of your cortex and hippocampus can grow stronger with practice. The science is unambiguous on this. The more you use your brain — the more you engage it in genuinely challenging, unfamiliar work — the more those neuronal networks consolidate and expand. You can acquire any talent you wish to have. There is no ceiling imposed by biology. The only ceiling that is real is the one built from a belief that the ceiling is real.
We should never tell our children they are not good at something. And we should stop telling ourselves that, too.
Five Steps to Become One Notch Smarter in Three Months
I want to give you something concrete. Not a philosophy — a method. Five steps that, practiced with genuine commitment over ninety days, will make you measurably better in any field you choose. Not the best in the world. One notch better than you are today. Which is all it ever takes.
Step 1: Shift the narrative in your head. You have to genuinely believe — not just tell yourself — that you can get better at almost anything. Because you can. The science is on your side. Every story you carry about what you’re “just not good at” is a story about where you haven’t practiced yet, not about what your brain is capable of.
Step 2: Make a list. Write down the things you would love to be good at. Dancing. Chess. Math. Cooking. Public speaking. Remembering names. Learning a language. Whatever genuinely excites you — not what impresses other people. Just make your list and be honest about it.
Step 3: Choose one. From that list, identify the one skill or hobby that would bring the most joy to your life if you became genuinely good at it. The one you feel most passionate about. Decide on that single thing. Focus matters here — the brain builds its networks through repetition of a specific demand, not through scattered effort across a dozen things simultaneously.
Step 4: Practice it every day — even for a few minutes. Take a class. Watch a YouTube series. Find a mentor. But whatever you do, touch it daily. You don’t need hours. You don’t need a perfect structure. You need to challenge that specific part of your cortex and hippocampus consistently enough that those neuronal networks have a reason to consolidate. Your only goal is to be slightly better than you were yesterday.
Step 5: Be persistent — and be proud of your mistakes. This step matters more than any of the others. Three months of consistent practice, even modest practice, will produce measurable change in the brain. That is not a promise — that is what the MRI shows. But persistence is the prerequisite.
And here is something I want you to hold onto: every time you make a mistake in the process of learning something difficult, you are among the rare few who had the courage to step outside their comfort zone. Most people don’t do that. Most people stay comfortable and tell themselves they’re not as capable as others. You’re different. Give yourself credit for that.
What 40 Years of Studying the Brain Has Taught Me
I have spent nearly four decades studying the brain, mostly at Johns Hopkins and Harvard Medical School. I have treated thousands of patients across a very wide range of cognitive conditions — from children with attention challenges to adults in the early stages of Alzheimer’s. And the one thing I know with certainty, after all of that research and all of those patients, is this:
Your brain has far more capacity than you have ever used. It is far more intelligent than you think it is.
Every day you choose to challenge it — in any domain, at any level — you are making that foundation larger and stronger. And every day you tell yourself the story that you’ve already reached your ceiling, you are choosing not to.
Start today. Just one notch. Just try to be slightly better at one thing than you were yesterday.
In three months, you will be much, much better than you are today.
Dr. Majid Fotuhi is a Harvard- and Johns Hopkins-trained neurologist, bestselling author of The Invincible Brain (USA TODAY Bestseller), and one of the world’s leading experts on brain health and cognitive performance. To discover your brain health score and receive a personalized 10-page report, take the free Invincible Brain Assessment at invincible.drfotuhi.com.
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The Best Morning Routine for a Sharper Brain
What you do in the first hour after you wake up matters more for your brain than anything else you do all day.
I know that sounds like a big claim. But once you understand what’s happening inside your head first thing in the morning, I think you’ll agree, and you’ll want to treat that hour differently starting tomorrow.
Let me explain the science, and then walk you through the exact four-step routine I recommend.
Why the First Hour Matters So Much
While you sleep, your brain runs a kind of cleanup crew called the glymphatic system. It flushes out the cellular waste your neurons produce throughout the day. So the moment you wake up, your brain is at its cleanest and most primed state.
That’s exactly why the first hour of your day carries so much weight. Your brain doesn’t just react to your day; it helps create it. What you feed it in those early minutes, in thoughts and in actions, sets the tone for everything that follows.
Here’s how I recommend using that hour, step by step.
Step 1: Don’t Rush Out of Bed
When you open your eyes, resist the urge to jump up, and whatever you do, don’t reach for your phone yet.
Instead, take a few minutes to think through your life. I like to focus on three sets of thoughts.
First, reconnect with your passions and your long-term goals. Visualize the life you’re working toward and the things that bring you the most joy.
Second, remind yourself that you’re capable of far more than you give yourself credit for. Most of the people you admire got where they are through effort, not luck. You can achieve any goal you set for yourself.
Third, tell yourself that things today will work out in your favor. Picture having a great day. And remind yourself that even when setbacks happen, they often become the first step toward something better.
A couple of minutes of this is enough to shift your whole mindset before your feet even touch the floor.
Step 2: Breathe and Feel Grateful
Still in bed, spend about five minutes on slow breathing or a short meditation.
Use this time to think about all the wonderful things you already have in your life. As you take each deep breath, remind yourself how fortunate you truly are. This isn’t about ignoring your challenges. It’s about setting the emotional tone of your day with energy and enthusiasm instead of stress and rush.
This step matters more than it might seem, and here’s why.
Chronically high levels of the stress hormone cortisol are toxic to your brain. When cortisol stays elevated day after day, it acts almost like a slow poison to the hippocampus, the part of your brain responsible for learning and memory, and the very region that shrinks first in Alzheimer’s disease.
A few minutes of gratitude and calm breathing is one of the simplest ways to keep that stress response in check. You are, quite literally, protecting the part of your brain you rely on to stay sharp and remember your life.
Step 3: Get Up and Move
By now you’ve spent about seven minutes still in bed, and your mind is already in a good place. Now it’s time to actually get up and move.
If you can, do some exercise or yoga every morning. A short run, a bike ride, a swim, or a simple stretching routine gets your neurons firing even if it’s only for 10 to 15 minutes.
If morning exercise isn’t possible for you, use this time for your daily family routines instead, like getting the kids ready for school. Either way, you’re moving your body and your mind into the rhythm of the day. Consistency matters far more here than intensity.
And if you need to check your emails or messages, this is the time. But don’t waste any of your precious morning on social media.
There’s real evidence behind the exercise piece specifically. A 2024 study found that twelve weeks of exercise was associated with significant changes in the hippocampus and improved neuroplasticity, your brain’s ability to learn and adapt. Your muscles aren’t the only thing that gets larger and stronger when you exercise. Your brain does too.
Step 4: Fuel Your Brain
Once you’ve moved your body or handled your morning chores, it’s time to eat.
An ideal breakfast for a sharper brain is built around protein and fiber, with coffee or tea if you like. You can alternate through the week so it never gets boring. One morning, try an omelet with vegetables and a slice of whole-grain toast. Another, oatmeal with blueberries and milk.
Rotate in nuts, berries, olive oil, leafy greens, poultry, or fish when you can. These are staples of the Mediterranean diet, which research shows can slow cognitive decline.
None of this requires a complicated meal plan. It just takes a little intention before you walk out the door.
The Bigger Picture: You Can Shape Your Brain
Having gone through a series of rejuvenating thoughts, some movement, and a healthy breakfast, you head out the door full of energy, ready to take on the world.
Here’s what I most want you to remember. Neuroplasticity is the most remarkable property of the human brain. It means you are not stuck with the brain you have today. You can actively shape and strengthen it, improving both how you experience life right now and how sharp you stay decades from now.
The morning is the single best window each day to prime your brain for the highest levels of neuroplasticity. And the routine itself is not complicated:
Warm up your mind with positive thoughts for two minutes. Add five minutes of deep breathing and gratitude. Move your body for 10 to 15 minutes. Finish with a high-protein, high-fiber breakfast. Then step out of the house full of positive thoughts and energy.
These four simple morning steps will help you have a great day today and stay sharp for years to come.
Dr. Majid Fotuhi is a Harvard- and Johns Hopkins-trained neurologist, bestselling author of The Invincible Brain (USA TODAY Bestseller), and one of the world’s leading experts on brain health and cognitive performance. He has spent more than three decades studying the brain’s capacity for growth and repair. To discover your brain health score and receive a personalized 10-page report, take the free Invincible Brain Assessment at invincible.drfotuhi.com.
📺 Watch the full video on Dr. Fotuhi’s YouTube Channel.
What Sugar Really Does to Your Brain (and How Ozempic Fits In)
What if I told you that eating a donut can do something to your brain that looks a lot like what cocaine does to it?
I know that sounds dramatic. But by the time you finish reading this, I think you’ll see it differently. Because the truth is that sugar isn’t just fattening, it’s actually toxic to your brain. Obesity can shrink your brain at any age. And the new class of weight-loss drugs everyone is talking about may be doing something in the brain that goes well beyond the number on the scale.
Let me walk you through what actually happens when you eat.
The Sugar Spike and the Crash That Follows
When you eat sugar, your blood glucose rises. Your pancreas responds by releasing insulin, a hormone that works like a key, unlocking your cells so glucose can get inside and be turned into energy.
The type of food matters enormously here. Complex carbohydrates like fruits and vegetables cause a slow, gentle rise in blood sugar. But a donut or a bowl of ice cream causes a sharp spike, which triggers a flood of insulin. That surge of insulin then pushes your blood sugar too low, and that crash is what leaves you hungry and craving sugar again an hour later.
Repeat that cycle day after day, and it often leads somewhere you don’t want to go: diabetes and obesity.
Three Ways This Cycle Quietly Damages Your Health
Over time, this pattern of sugar spikes and insulin surges causes three deeper problems.
First, your cells can become resistant to insulin. Sugar starts building up in your blood instead of getting inside your cells where it belongs. This is called insulin resistance, and it’s an early step toward metabolic syndrome and diabetes.
Second, excess sugar binds to proteins throughout your body in a process called glycation. Too much glycation impairs how those proteins function. This is part of why patients with poorly controlled diabetes can lose sensation in their toes, lose their vision, or damage their kidneys to the point of needing dialysis.
Third, high sugar levels generate free radicals and inflammation everywhere — throughout your body and inside your brain.
Why Sugar Is Toxic to Your Brain
This is where it gets personal for me as a neurologist.
In animal studies, high sugar levels reduce the number of dendrites, the branches on your neurons that receive connections from other neurons. Fewer connections mean less communication between brain cells, and that shows up in real life as brain fog and memory loss.
A high-sugar diet also reduces neurogenesis, the birth of new neurons in your hippocampus, which is your brain’s memory center. In other words, sugar makes it harder for your brain to build the very cells you rely on to learn and remember.
And in human studies, obesity is consistently linked to a smaller hippocampus and a higher risk of disease.
Brain Shrinkage Happens at Every Age
Here’s what surprises most people: this isn’t just a concern for older adults.
Brain atrophy linked to excess body fat shows up across every age group. Even children are not spared. When obesity affects a young brain, some of the academic struggles we see in kids may actually be tied to changes in the hippocampus and other brain regions.
There’s also a circulation piece to this story. In people with multiple risk factors, researchers have found lower blood flow throughout the brain, along with lower scores on memory and other brain functions. Less fuel reaching the brain means less capacity to think, focus, and remember.
Why We Eat and Why Willpower Isn’t the Whole Story
So why do we eat in the first place, and what actually controls our eating behavior?
Part of the answer is hormonal. Chemicals in your blood, leptin, insulin, and others, tell your brain when to stop eating, while ghrelin, the “hunger hormone,” tells your brain to eat more.
But eating isn’t only about hunger. Your brain’s reward system, the same circuitry involved in addiction, lights up when you eat, and especially when you eat sugar. Over time, this creates craving and tolerance. You crave sugar constantly, and you need more of it to feel the same satisfaction you once got from less.
Your prefrontal cortex is supposed to act as the brake on all of this, the part of your brain that helps you stop after the first bite. But in obesity, the prefrontal cortex doesn’t work as well, and your willpower around food shrinks along with it.
I want to be clear about what this means: eating too much is not simply a lack of discipline. For many people, it reflects a genuine addiction to food. That’s not an excuse; it’s a starting point for real solutions.
Where Ozempic Fits In
This brings us to the newest piece of the puzzle.
Medications like Ozempic work in three places at once. In the pancreas, they increase insulin and lower a hormone called glucagon. In the stomach, they slow digestion so you feel full faster and for longer. And in the brain, they reduce appetite directly, quieting the cravings that drive addictive eating.
Many patients on these drugs describe something fascinating: a quieting of what’s been called “food noise,” the constant mental chatter about food that runs in the background all day. Researchers are now studying whether these same medications might help with Alzheimer’s prevention, and even with addiction to alcohol, smoking, or other behaviors, since they appear to turn down the brain’s reward and addictive pathways.
But turning down the reward system isn’t free of trade-offs. Some patients report depression, fatigue, or even brain fog. This is still very much an active area of research, and I’ll be watching it closely.
What I Want You to Remember
Your brain is not separate from the food you eat. Every sugar spike and every extra pound leaves a mark on every organ in your body and on your brain.
If you want to stay sharp, the path is clear. Eat healthy food in reasonable portions. Exercise often. When you are fit, your brain simply works better.
People have known the essence of this for centuries: healthy body, healthy mind. What’s different now is that, for the first time, we have the scientific data to understand exactly how it works and how you can use that knowledge to take back control of your eating and protect your brain for decades to come.
Dr. Majid Fotuhi is a Harvard- and Johns Hopkins-trained neurologist, bestselling author of The Invincible Brain (USA TODAY Bestseller), and one of the world’s leading experts on brain health and cognitive performance. He has spent more than three decades studying the brain’s capacity for growth and repair. To discover your brain health score and receive a personalized 10-page report, take the free Invincible Brain Assessment at invincible.drfotuhi.com.
📺 Watch the full video on Dr. Fotuhi’s YouTube Channel.
Why Exercise Is the Most Important Pillar of Brain Health
I want to talk to you about the single most important thing you can do for your brain.
In my work as a neurologist, I describe five pillars of brain health: fitness, sleep, nutrition, mindset, and brain training. Each of them matters. Each of them, done well, makes your brain measurably stronger. But they are not equal, and by far the most important pillar of brain health is exercise and fitness.
I know that “exercise is good for you” sounds like advice you have heard a thousand times. What most people have never heard is why, what actually happens inside your brain and your cells when you move your body. Once you understand the biology, exercise stops being a chore on your to-do list and becomes more like a superpower.
Let me walk you through it.
Tiny Factories Power Your Cells, and You Can Build More of Them
Inside every one of your cells are small structures called mitochondria. Think of them as tiny factories that generate ATP, the energy currency of your body. Everything you do requires ATP. Your brain runs on it. So does your heart, your kidneys, your muscles, your skin. Nothing in your body works without the energy these little factories produce.
Here is the part that should concern you: with aging, both the number and the function of your mitochondria decline with every decade of life. It is one of the quiet engines of aging, operating silently in the background, long before you feel any difference.
And here is the part that should excite you: exercise reverses that decline.
When you exercise, you increase the number of mitochondria inside your cells. More factories. More energy. More capacity in every organ of your body, including your brain. If you want to rejuvenate every cell in your body at the most fundamental level, this is how you do it. And the best way to build more mitochondria is to build your fitness stamina.
More Blood Vessels, More Oxygen, More Nutrition
The second thing exercise does is expand your brain’s supply lines.
Physical activity increases the number of capillaries, the small blood vessels that deliver blood throughout your brain, your retina, your skin, and every other organ. More vessels mean more blood flow. More blood flow means more oxygen and more nutrition reaching every cell in your body.
Your brain is one of the most metabolically demanding organs you have. It depends, moment to moment, on a rich and steady supply of oxygen and nutrients. When you exercise regularly, you are literally upgrading the infrastructure that feeds it.
Exercise Grows the Part of Your Brain That Remembers
The third effect is, to me, the most remarkable of all.
Deep inside your temporal lobe sits a structure roughly the size of your thumb called the hippocampus. It is the ground zero for learning and memory in your brain. And when you exercise, you increase the number of neurons and synapses inside your hippocampus.
Let that sink in. Physical movement, walking, swimming, dancing, and playing tennis, causes new brain cells and new connections to form in the exact region that determines how well you learn and remember.
The downstream benefits are exactly what you would expect. People who exercise have a larger hippocampus and a larger cortex. They have better memory. They sleep better and enjoy a better mood. They are far less likely to develop Alzheimer’s disease decades later and less likely to suffer heart attacks and strokes along the way.
There are very few things in medicine I would call a no-brainer. Exercise is one of them.
The One Number That Predicts Your Brain’s Future
So what does it actually mean to be “fit”?
Fitness means stamina and endurance. How many flights of stairs can you climb? How far can you walk without stopping? These everyday questions point to something we can measure precisely, a number called VO2 max.
VO2 max is the total amount of oxygen your body can consume at peak exercise, usually measured in milliliters of oxygen per minute per kilogram of body weight. It is the gold-standard measure of cardiovascular fitness and endurance.
And it turns out to be far more than a fitness statistic. People with a higher VO2 max have more mitochondria in their cells, a bigger hippocampus, and a far lower likelihood of developing Alzheimer’s disease. It is a remarkable measurement, a single number that can tell you, today, what is likely to happen to your brain in the future.
You can measure your VO2 max precisely at a gym or a doctor’s office. But there are also simple ways to estimate it: walk one or two miles, then record your time, your heart rate, and your weight, and calculate your approximate VO2 max. I strongly recommend that you measure it and use that number as your baseline. What gets measured gets improved.
How to Build Your Fitness: The Right Way
If you have not been active, the path forward is simpler than you think. Here is what I tell my patients:
Start slowly. Do not go from nothing to a lot in one week. Begin with walking, and increase the amount of exercise you do on a weekly basis. Gradual, consistent progress is what builds mitochondria and what prevents injury and burnout.
Be persistent and win the first step. Some mornings, you will wake up and not feel like going for a walk. Do not negotiate with that feeling. Just get up and go. Once you have put your shoes on and stepped outside, the rest is easy. The first step is the difficult part; everything after it takes care of itself.
Find the exercise you actually like. If you don’t enjoy the gym, don’t go to the gym, go for a walk. If you don’t like running, play tennis. If you don’t like tennis, take dancing lessons. Do something you genuinely enjoy, because the best exercise is the one you will still be doing three months from now. Remember: the more active you are, the more mitochondria you generate.
My Prescription
Exercise is the most important thing you can do for your brain, and you need to do it every day.
My recommendation is simple: remain active every single day. Walk 5,000 steps or more as much as you can. Get at least three hours of real exercise each week, and make sure it is something you enjoy.
Do this consistently, and you will be doing the best possible service for your brain and your body. You will live longer. And you will stay sharp well into your 80s and 90s.
Dr. Majid Fotuhi is a Harvard- and Johns Hopkins-trained neurologist, bestselling author of The Invincible Brain (USA TODAY Bestseller), and one of the world’s leading experts on brain health and cognitive performance. He has spent more than three decades studying the brain’s capacity for growth and repair. To discover your brain health score and receive a personalized 10-page report, take the free Invincible Brain Assessment at invincible.drfotuhi.com.
📺 Watch the full video on Dr. Fotuhi’s YouTube Channel.
Keep up with Dr. Fotuhi on LinkedIn & Instagram.