The number of people living with dementia worldwide is projected to nearly triple by 2050, rising from around 57 million today to over 150 million.

Alzheimer’s disease accounts for the majority of cases, but it is only part of a broad group of neurodegenerative conditions that share a common thread: a slow, progressive loss of brain function that begins years, often decades, before symptoms appear.

Many people have been affected by neurodegenerative disease through a parent, grandparent, or close relative. And when that happens, it naturally raises a question: what does this mean for me?

It’s a deeply human concern — and a very understandable one.

Neurodegeneration is Not Inevitable

While having a family history can increase risk, risk is not the same as diagnosis. 

Many people with an affected relative never develop a neurodegenerative condition, while others do without any clear family link.

Genes are only one part of the picture. A wide range of biological, lifestyle, and environmental factors influence how the brain changes over the course of a lifetime.

Key risk factors include:

• Age (the strongest risk factor)

• Cardiovascular and metabolic health

• Long-term high blood pressure

• Diabetes

• Physical inactivity

• Poor sleep

• Social isolation

• Smoking

• Excessive alcohol consumption

• Low levels of lifelong cognitive stimulation

• Head injuries

• Chronic stress

Importantly, these factors do not determine anyone’s future with certainty. 

Many people with several risk factors never develop a neurodegenerative condition, while others with few obvious risks do. 

Instead, they help explain how brain health is shaped by the whole body and by long-term patterns of living, not by family history alone.

This does not mean risk can be eliminated, or that those affected have done something wrong. Neurodegeneration is complex. 

It does mean that there are meaningful ways to influence your brain health over time.

Understanding these influences helps reframe a fearful situation into a more constructive one: supporting your brain’s health and resilience over the long-term.

How the Brain Changes Before Symptoms Appear

One of the defining features of neurodegenerative disease is the long gap between early biological changes and the onset of symptoms.

In Alzheimer’s disease, for example, the processes that underlie cognitive decline are thought to begin 15 to 20 years before noticeable impairment.

This has an important implication: by the time symptoms appear, significant changes have already taken place.

The most meaningful window for supporting brain health is not when symptoms emerge, but in the decades that precede them.

This is why the conversation is increasingly shifting from treatment to prevention, and why brain health matters well before older age.

The Brain’s Built-In Resilience: Neuroplasticity and Cognitive Reserve

Throughout life, the brain continuously adapts in response to how it is used – a property known as neuroplasticity.

When you learn new skills, solve problems, or challenge yourself in unfamiliar ways, the brain forms and strengthens connections between neurons.

Over time, this builds cognitive reserve – the brain’s ability to remain functional and resilient in the face of ageing or disease-related changes.

People with greater cognitive reserve appear better able to compensate for neurological damage, with symptoms emerging later or progressing more slowly, even when underlying pathology is similar.

Cognitive reserve does not prevent neurodegeneration. But it provides a meaningful buffer – one that can be built over a lifetime through consistent mental engagement.

Practical Ways to Keep the Brain Engaged and Adaptable

Activities that encourage learning, novelty, and coordination help create new neural pathways in the brain and reinforce existing ones, strengthening cognitive reserve.

This doesn’t require extreme mental workouts or constant productivity, just giving the brain regular reasons to adapt.

Learning a new language, developing a new skill, practising a musical instrument, taking up unfamiliar hobbies, and playing new games with rules and strategies are all particularly strong neuroplasticity-inducing activities.

Everyday variation also matters. Changing routines, taking different routes to places, using your non-dominant hand for simple tasks like brushing your teeth, practising balancing or simple coordination exercises like alternative finger tapping, can all encourage the brain to adapt and form new connections.

The key is consistency and variety – not intensity. Consistently exposing the brain to new and varied experiences helps support flexibility and resilience – qualities that matter for brain health at any age.

Lifestyle Habits That Support Brain Health

Beyond mental engagement, the broader systems that support the brain also play an important role.

The brain does not operate in isolation. It depends on healthy blood flow, stable energy supply, good sleep, and balanced stress responses.

A varied, nutrient-dense diet and maintaining a healthy weight support both cardiovascular and metabolic health, which in turn support brain function.

Regular physical activity reinforces these same systems by improving circulation and supporting healthier blood pressure and blood sugar control over time.

Sleep plays a particularly important role. Good quality, regular sleep supports learning, memory consolidation, and the brain’s ability to repair itself and clear waste products. Chronic sleep deprivation, by contrast, places ongoing strain on these processes.

Chronic stress keeps the brain and body in a constant state of high alert, which over time can disrupt sleep, impair memory, and contribute to broader metabolic and inflammatory imbalance. Supporting more balanced stress responses — through movement, time in nature, mindfulness, meditation, breathwork, and sustainable work–rest rhythms — helps reduce this strain and creates better conditions for long-term brain health.

Social connection and a sense of purpose also matter more than many people realise. Staying socially engaged and involved in meaningful activities supports emotional wellbeing and cognitive function throughout life, while helping to protect against isolation — itself a recognised risk factor for cognitive decline.

Supporting Brain Health with Targeted Nutrition and Supplements

Several nutrients linked to brain health can be incorporated directly through everyday food choices.

Omega-3 fatty acids, particularly DHA, are abundant in oily fish such as salmon, sardines, and mackerel. They contribute to the structure and function of neuronal membranes and support synaptic signalling and inflammatory balance.

Choline, found in foods such as eggs, plays a central role in the production of acetylcholine – a neurotransmitter essential for memory and learning.

Saffron, used traditionally as a culinary spice, has demonstrated antioxidant and neuroprotective properties in both clinical and preclinical research.

Beyond food-based strategies, certain supplements may offer additional targeted support.

Creatine, best known for its role in muscle energy metabolism, also plays a part in brain energy dynamics, and emerging evidence suggests it may support cognitive performance and neuronal resilience, particularly under conditions of metabolic stress.

Omega-3 supplements can also be a practical option for those who do not regularly consume oily fish.

These approaches are best seen as supportive rather than preventative or curative – part of a broader, long-term strategy to create favourable conditions for brain health.

A Realistic but Empowering Perspective

There is no guaranteed way to prevent neurodegenerative disease, and no single intervention eliminates risk.

Supporting brain health is therefore not about eliminating risk, but about creating the conditions that help the brain function as well as possible over time.

Looking after your body and brain through healthy eating, regular physical activity, good sleep, stress management, social connection, and ongoing mental engagement supports not only cognition, but overall health and quality of life.

Focusing on sustaining these habits over the long-term helps shift the mindset from fear to empowerment.

But remember, concerns about memory or thinking should always be discussed with a healthcare professional, particularly if changes are noticeable or persistent.

The goal is not certainty – it is resilience, adaptability, and giving your brain the strongest possible foundation for the years ahead.

By George Jackson, MSc