What if one of the most powerful tools for protecting the ageing brain is already inside it?
A fascinating new study gave healthy older adults placebo pills for three weeks. Some were told they were taking a supplement to support wellbeing, while others were told outright that the pills contained no active ingredient—they were placebos.
Yet their brains still responded.
Those knowingly taking the placebo showed improvements in short-term memory, physical performance and perceived stress. In some measures, they did just as well as—or even better than—those who believed they were taking an active supplement.
Think about that for a moment. They knew the pill was inactive, yet something changed.
I think this challenges how we view both the placebo effect and the ageing brain. We often use “placebo” to imply that nothing really happened, as though improvements driven by the brain somehow don’t count. But perhaps it’s the opposite. The placebo effect may reveal just how powerful the brain’s influence over the body can be.
The brain isn’t a passive organ simply waiting to decline with age. It constantly responds to its environment, adapting and strengthening connections through what we repeatedly do, experience, practise and even expect. This is neuroplasticity, and it doesn’t disappear as we grow older.
The brain also communicates continuously with the rest of the body, influencing the autonomic nervous system, hormones, immunity, movement, sleep and our response to stress. We know that exercise, sleep, learning and social connection all shape brain health. Perhaps it shouldn’t be so surprising that our expectations can too.
Our brains have an extraordinary capacity to adapt, recover and participate in their own healing.
That doesn’t mean we can simply think ourselves well. Disease, brain injury and neurodegeneration are real. Mindset is not a substitute for medical care, nutrition, exercise or addressing the biological drivers of disease. But neither should we underestimate the healing mechanisms already built into us.
This becomes especially relevant as we age.
Imagine you’re 70 and forget someone’s name. If your first thought is, “I’m getting old. My memory is failing,” you may begin trusting your memory less, avoiding challenges and reinforcing the belief that decline is inevitable.
Now imagine responding with a different belief: My brain is still capable of change.
That thought alone won’t prevent dementia. But it may change what you do next. You might keep learning, exercising, staying socially connected, prioritising sleep, managing stress and challenging your memory.
And those behaviours feed directly back into biology.
That’s why I think the most fascinating part of this study isn’t the placebo itself—it’s what it revealed.
There was no active ingredient, yet measurable improvements occurred in memory, physical performance and stress. Somehow, the experience of receiving an intervention—even while knowing it was a placebo—was enough to influence what happened next.
We spend so much time asking what we should take to protect the brain: which supplement, nutrient or medication.
Perhaps we should also ask a bigger question:
What environment are we creating for the brain to heal, adapt and thrive?
Because your brain isn’t simply waiting to grow old.
It is listening. Learning. Adapting. And changing every single day.
