Our brains evolved over millions of years for a world that no longer exists. Yet every day we’re asking them to cope with endless notifications, social comparison, impossible expectations and information overload. Is it any wonder so many of us feel stressed, anxious and exhausted?
If you’ve ever wondered why life seems harder than it should—even when, on paper, everything looks good—there’s a fascinating explanation.
In this episode of The Midlife Mentors, we spoke with neuroscientist and visiting professor Dr Paul Goldsmith, author of The Evolving Brain: How to Thrive in a World We Weren’t Made For. His message is both reassuring and empowering:
There isn’t something wrong with you. Your brain is simply trying to operate in an environment it was never designed for.
Understanding that one idea can completely change how you think about stress, anxiety, motivation and happiness.
Your Brain Wasn’t Designed for the Digital Age
Human brains weren’t built overnight.
According to Dr Goldsmith, if the entire evolution of the brain were represented as a one-kilometre walk, modern humans would occupy only the final 60 centimetres—and the digital age would be little more than the width of a human hair at the very end.
Evolution works incredibly slowly.
Technology changes almost overnight.
The result is what scientists call an evolutionary mismatch.
Our ancient brains are trying to solve modern problems using survival mechanisms that worked brilliantly thousands of years ago—but often work against us today.
Anxiety Isn’t a Design Flaw—It’s a Survival Tool
Most people think anxiety is something to eliminate.
In reality, it’s something evolution deliberately gave us.
Imagine our ancestors hearing a rustle in the bushes.
Was it the wind?
Or was it a predator?
Evolution rewarded the people who assumed the worst.
If they ran away unnecessarily 99 times but survived the 100th encounter with a tiger, their genes lived on.
Your brain still works exactly the same way.
The problem is that today’s “predators” aren’t lions.
They’re:
- Constant breaking news
- Endless emails
- Financial worries
- Social media
- Work deadlines
- Notifications
- AI
- Information overload
Your brain doesn’t distinguish particularly well between physical threats and psychological ones.
It simply keeps sounding the alarm.
Why We Feel Melancholy More Than Ever
One of the most fascinating parts of our conversation was Dr Goldsmith’s explanation of melancholy.
Rather than viewing it simply as sadness, he describes it as an evolutionary signal.
Our brains are built around goal pursuit.
Whether finding food, shelter or a mate, our ancestors constantly worked towards meaningful goals.
Dopamine—the brain chemical so often misunderstood—isn’t really about receiving rewards.
It’s about pursuing them.
That’s an important distinction.
Modern life has quietly removed much of that pursuit.
Today we can:
- Order food instantly
- Find dates from the sofa
- Shop with one click
- Stream endless entertainment
- Ask AI for immediate answers
We’ve become increasingly passive.
At the same time, we’ve replaced simple survival goals with enormous, long-term ambitions:
- Bigger houses
- Better job titles
- More money
- More followers
- Greater status
These goals often take years—or decades—to achieve.
Some are never fully achievable at all.
When our brains believe we’re making insufficient progress, they generate melancholy as a signal to withdraw.
The problem isn’t you.
It’s the goals we’ve inherited from modern society.
Social Media Has Changed the Rules
For most of human history, we compared ourselves with perhaps 30 to 50 people.
Our tribe.
Today?
We’re comparing ourselves with billions.
Every scroll presents someone who appears:
- Richer
- Healthier
- Happier
- More productive
- Better looking
- More successful
It’s an impossible game.
As Dr Goldsmith explains, our brains are deeply motivated by two social needs:
- Validation (feeling accepted)
- Status (our position within the group)
Social media amplifies both to unhealthy extremes.
The result is a constant feeling that we’re falling behind—even when we’re doing remarkably well.
The Productivity Trap
One topic we explored was today’s obsession with relentless productivity.
The culture of:
Wake up at 4am.
Hustle harder.
Grind every day.
Discipline certainly has its place.
But there’s a danger in pursuing goals simply because our ego—or social media—tells us we should.
Sometimes resilience isn’t about pushing harder.
Sometimes it’s about asking:
Do I even want this anymore?
Our brains evolved to constantly reassess whether a goal is still worth pursuing.
Many of us never pause long enough to ask.
AI: Helpful or Harmful?
Artificial intelligence is transforming every aspect of modern life.
Dr Goldsmith views AI as another leap in the externalisation of human knowledge—similar to the invention of writing.
But he also raises an important warning.
The brain follows one fundamental principle:
Use it or lose it.
Research has shown that London taxi drivers developed larger brain regions responsible for navigation because they memorised thousands of streets.
When they retired, those areas shrank.
Today we rely on sat navs.
Tomorrow we may rely on AI to think for us.
If we stop exercising certain mental skills, the brain adapts accordingly.
Convenience always comes with a cost.
Why Real Relationships Matter More Than Ever
Perhaps the most practical takeaway from the episode was this:
Your wellbeing depends far more on a handful of close relationships than hundreds—or thousands—of online connections.
Humans evolved as profoundly social creatures.
Being excluded from the tribe once meant death.
That need for genuine belonging remains deeply wired into us.
Research suggests we can meaningfully maintain around 150 relationships.
But the truly important number is much smaller.
Just three to five people who would genuinely be there when life becomes difficult can dramatically improve both mental and physical health.
Followers aren’t friendships.
Likes aren’t connection.
Real conversations still matter.
What Can We Do?
The good news is that understanding your brain gives you choices.
Dr Goldsmith recommends focusing on a few simple principles:
1. Stop asking, “What’s wrong with me?”
Instead ask:
“What is my brain trying to tell me?”
That subtle shift replaces self-blame with curiosity.
2. Choose Better Goals
Not every goal deserves your energy.
Ask yourself:
- Is this goal genuinely mine?
- Am I pursuing it for fulfilment or validation?
- Does it move me towards the life I actually want?
3. Move Every Day
Physical activity remains one of the most reliable ways to stimulate healthy dopamine production.
Movement isn’t simply good for your body.
It’s what your brain evolved to expect.
4. Invest in Real Friendships
Schedule time with people who genuinely know you.
Those relationships are one of the strongest predictors of long-term happiness and health.
5. Design Your Environment
Willpower is overrated.
Environment shapes behaviour.
If you want healthier habits, make healthy choices easier.
Remove unnecessary friction.
Make the right behaviour the default.
6. Reduce the Noise
Your frontal lobes are incredible.
They allow planning, creativity and long-term thinking.
Unfortunately, they also allow endless rumination.
Modern life constantly feeds those thoughts.
Sometimes the most productive thing you can do is switch off the inputs.
Walk without headphones.
Sit quietly.
Allow your brain space to settle.
The Bottom Line
One of the most comforting messages from this conversation is this:
You are not failing.
Many of the struggles people experience in midlife aren’t signs of weakness.
They’re signs that an ancient brain is trying to navigate an extraordinarily modern world.
Once you understand why your brain behaves the way it does, everything changes.
You stop blaming yourself.
You start working with your biology instead of against it.
And perhaps that’s one of the greatest gifts we can give ourselves in midlife—not perfection, but understanding.
Because awareness really does precede change.
Key Takeaways
- Your brain evolved for survival, not modern convenience.
- Anxiety is a normal survival mechanism, not a personal flaw.
- Dopamine is driven by pursuing meaningful goals—not instant gratification.
- Social media fuels unhealthy comparison and unrealistic status goals.
- Real friendships are one of the strongest predictors of long-term wellbeing.
- Movement, meaningful goals and reducing information overload help your brain function as it was designed to.