The Damage to Your Brain May Have Already Started Says Neurophysiologist Louisa Nicola
- 14 hours ago
- 6 min read
Louisa Nicola is a clinical neurophysiologist, brain performance specialist, and founder dedicated to advancing cognitive longevity and helping end Alzheimer’s disease. With a background in mathematics and science, and hands-on experience in neurosurgery, she has built her career at the intersection of research, prevention, and real-world brain optimisation. Through her work, Nicola translates complex neuroscience into practical strategies that empower individuals to protect and strengthen their cognitive health long before decline begins.
In a world where burnout is normalised and longevity is often misunderstood, Nicola is part of a new wave of experts reframing brain health as something measurable, protectable, and deeply personal. Below, she shares her insights on prevention, performance, and the everyday decisions that shape the future of our brains.
You've made brain health your life's work. When you say "brain health," what does that actually mean in practical, everyday terms?
It means how well your brain is actually functioning. Not just whether you can remember where you left your keys, but how clearly you think, how fast you process information, how well you regulate your emotions, how deeply you sleep. Brain health shows up in everything. Your focus at work, your patience with your kids, your ability to learn something new at 50 the way you did at 25. When I say brain health, I mean the stuff that makes you you, and whether that's being protected or slowly eroded by how you're living.
"The changes that lead to Alzheimer's start 20 to 30 years before a diagnosis."
Your mission to help end Alzheimer's is very clear. What first drew you to this, and why does it feel urgent right now?
I've been studying the brain since 2012. I earned my master's degree in Mathematics, then went into science and medicine, specifically moving into clinical neurophysiology, where I get to be in neurosurgery working with real humans and real brains. So I've seen what happens when the brain breaks down. But the moment that really changed everything for me was understanding that two-thirds of Alzheimer's patients are women, and almost nobody was talking about why. Not in any meaningful way. The urgency is simple: the changes that lead to Alzheimer's start 20 to 30 years before a diagnosis. That means women in their 40s and 50s, right now, today, are in the critical window. And most of them have no idea. That's what keeps me up at night.
Many people think brain decline is inevitable with age. What's one belief that needs to change?
That shrinking brains and fading memory are just "part of getting older." They're not. They're part of getting older without a plan. Yes, some cognitive changes happen with age. But significant decline? Dementia? That is not a given. The research is incredibly clear that lifestyle factors, how you move, sleep, eat, manage stress, stay connected, can dramatically alter your brain's trajectory. We've been sold this lie that decline is inevitable because it lets everyone off the hook. The medical system, the research institutions, even us as individuals. It's easier to accept it than to do something about it.
What are the most common habits you see that quietly harm brain health, even among people who consider themselves healthy or high-performing?
The big ones? Chronic under-sleeping and wearing it like a badge of honour. Skipping resistance training, or worse, just doing cardio and thinking that's enough. Under-eating protein, especially women over 40 who've spent decades dieting. Constant low-grade stress that never gets resolved, just managed with another glass of wine or another scroll through Instagram. And here's the sneaky one: social isolation. High-performing people are often so busy optimising their schedules that they've optimised out the thing their brain needs most, real human connection.
You often speak about prevention rather than treatment. What does protecting your brain early actually look like in real life?
It looks boring. I'm sorry, but it does, at least on the surface. It looks like lifting heavy things three to four times a week. Getting seven-plus hours of sleep consistently, not just on weekends. Eating enough protein and enough of the right fats. It looks like knowing your hormonal status and not being gaslit by a GP who tells you your symptoms are just stress. It looks like having hard conversations about hormone replacement therapy during perimenopause instead of white-knuckling through it. Prevention isn't glamorous. But neither is a diagnosis at 65 that started brewing at 45.
Stress, lack of sleep, and constant stimulation are normalised today. What long-term risks does this create if nothing changes?
You're essentially marinating your brain in cortisol and inflammation, day after day, year after year. Chronic stress shrinks your hippocampus, which is the memory centre of your brain and one of the first regions hit by Alzheimer's. Poor sleep means your glymphatic system, the brain's waste clearance system, can't do its job properly. So you're accumulating metabolic waste, including amyloid beta, the protein associated with Alzheimer's, faster than your brain can clear it. Constant stimulation keeps your nervous system locked in fight-or-flight. And here's what people miss: this isn't just about feeling tired or burnt out. This is structural damage. It's measurable. And it compounds over decades.
You work with people who want to stay sharp for decades. What do those who maintain strong cognitive health long-term do differently from the start?
They treat their brain like it matters before something goes wrong. They don't wait for a scare. They strength train consistently. They prioritise sleep like it's non-negotiable, not something to sacrifice for productivity. They eat for their brain, not just their waistline. They stay curious, they stay social, they challenge themselves mentally. And honestly? The biggest differentiator I see is that they take their hormonal health seriously. The women who get informed about what happens to their brain during perimenopause and actually act on it, those are the ones who stay sharp. The ones who push through and ignore it? That's where I see the trouble start.
There's a lot of noise around supplements, routines, and "biohacks." What foundations matter most before people focus on optimisation?
"You cannot supplement your way out of a bad foundation. Full stop."
Before you spend a single pound on a nootropic or a red light panel, ask yourself: Am I sleeping seven to eight hours? Am I strength training? Am I eating enough protein? Am I managing my stress, or am I just surviving it? Am I socially connected? If the answer to any of those is no, that's where your money and energy should go. The basics are unsexy, but they are responsible for about 80 percent of the outcome. Optimisation is the last five percent. Most people are trying to polish a house they haven't built yet.
How has your own understanding of brain longevity evolved over the last few years as science has advanced?
Massively. When I started, the conversation around Alzheimer's was almost entirely about amyloid plaques and pharmaceutical interventions. Now we understand so much more about the role of metabolic health, hormonal shifts, neuroinflammation, the gut-brain axis, the importance of muscle as essentially a cognitive organ. The work coming from researchers like Lisa Mosconi on the female brain, Roberta Diaz Brinton on oestrogen and neuroprotection, Stacy Sims on female physiology, it's completely reshaped how I think about prevention. We've moved from "there's nothing you can do" to "there's an enormous amount you can do, but you have to start now." That shift is everything.
If someone reading this wants to support their brain health starting today, what's one decision or habit you'd want them to prioritise first?
Start lifting weights. I know that's not what people expect to hear from a brain scientist, but muscle is one of the most underrated organs for cognitive protection. It secretes molecules that directly support brain function, it regulates your blood sugar, it protects against insulin resistance, which is one of the biggest risk factors for Alzheimer's. And for women especially, building and maintaining muscle during and after perimenopause is one of the most powerful things you can do for your brain. You don't need a fancy programme. You need to pick up something heavy, repeatedly, and keep doing it for the rest of your life.
Louisa Nicola’s perspective is both sobering and empowering. Brain decline, she argues, is not an unavoidable fate but often the result of accumulated neglect. The science is clear, and the window for prevention opens decades before diagnosis. From strength training to sleep, from hormonal awareness to social connection, the fundamentals are neither glamorous nor complicated — but they are transformative.
Nicola brings the conversation back to responsibility and agency. Protecting the brain is not about quick fixes. It is about deliberate, consistent action taken long before crisis strikes.
