Purpose: the brain’s north star

What gets you out of bed in the morning?

It’s a deceptively simple question, but the answer may hold more power than you think, especially when it comes to your brain. As a psychiatrist, I’ve come to appreciate that beyond the usual prescriptions – healthy food, exercise, good sleep – something less tangible plays a prominent role in cognitive health: a sense of purpose.

Purpose, loosely defined, is the feeling that your life has meaning and direction. It gives your actions a greater ‘why’. For some, it’s raising children or caring for a partner. For others, it’s creative work, spiritual fulfilment, or serving a cause bigger than themselves.

Whatever shape it takes, purpose acts as a psychological compass and recent studies suggest it might also be a neurological one.

People with a strong sense of purpose tend to live longer, healthier lives. This includes sharper thinking as they age. One longitudinal study from Rush University followed older adults for over a decade and found that those with higher purpose scores were 2.4 times more likely to remain free of Alzheimer’s disease.

Remarkably, even when their brains showed signs of pathological change – plaques and tangles – their cognition remained more resilient. It’s as if purpose provides a kind of mental scaffolding that supports function even as the structure starts to fray.

Why does this happen? The exact mechanisms are still unfolding, but we can make some educated guesses.

First, purpose helps regulate stress. When life feels meaningful, we tend to cope better with adversity. Chronic stress is toxic to the brain, particularly to the hippocampus – the memory centre – and dampening this response may protect cognitive function.

Second, purpose encourages healthier behaviour. People who feel they have something to live for are more likely to exercise, eat well and avoid harmful habits. These lifestyle choices, in turn, enhance blood flow to the brain, reduce inflammation and promote the birth of new neurons.

And third – perhaps most intriguingly – purpose appears to enhance brain plasticity. Engaging in purposeful activity often requires cognitive effort: planning, problem-solving, adapting. These are the skills that keep the brain agile, rewiring circuits and forging new connections.

But this isn’t just a message for those in their later years. Purpose is protective across the lifespan. Whether you’re 25 or 75, regularly engaging in meaningful activities nourishes brain health.

And it’s never too late to find (or redefine) your purpose.

So what does this look like in practice?

It might mean volunteering your time, mentoring someone younger, or taking up a cause close to your heart. It might involve deepening your relationships, reconnecting with your values, or simply noticing the moments in your day that feel fulfilling – and doing more of them. It doesn’t have to be grandiose or involved, just something that gives you a sense of satisfaction.

And no, purpose doesn’t mean you need to change the world. But it does ask you to connect to something that matters,  even if it’s just showing up fully for the people around you.

In my practice, I often see people who feel as though they have lost their sense of purpose – their children are independent, they have retired from their job and maybe their life-partner has died. These are difficult events to reconcile, but with enough exploration, we can almost invariably find something in their lives that provides purpose, and focusing on this can be enormously therapeutic.

If you’re struggling to find yours, it can be helpful to examine your everyday actions, past and present. When did you feel most alive? Most useful? Most content? These are good starting points.

 Kailas Roberts is a psychogeriatrician and author of Mind Your Brain: The Essential Australian Guide to Dementia, available at bookstores and online. Visit yourbraininmind.com or uqp.com.au.