Hi, Longevity Enthusiast,

Last week, we talked about what your sense of smell may reveal about your brain.

This week, it's another sense we tend to take for granted: hearing.

And the numbers are surprisingly serious.

The 2024 Lancet Commission on dementia identified hearing loss as one of the two modifiable risk factors associated with the largest proportion of dementia cases globally - approximately 7%, alongside high LDL cholesterol.

Not smoking.

Not physical inactivity.

Not obesity.

Hearing loss.

And perhaps the most important part is that it can begin affecting your life long before you think of yourself as someone who “can't hear.”

For many people, the first sign isn't that sounds disappear.

It's that speech becomes harder to understand.

You can hear someone talking.

You just can't quite make out what they're saying.

Especially when you're in a restaurant.

At a party.

In a car.

Or anywhere with competing background noise.

So you ask:

“Sorry, what did you say?”

Then again.

And again.

Eventually, something subtle can happen.

You stop asking.

Hearing isn't simply an ear problem.

Your brain has to take incoming sound and turn it into meaningful language.

When that signal becomes degraded, understanding conversation can require more effort.

What used to happen automatically can become cognitive work.

This may help explain why people with hearing difficulties sometimes describe conversations as exhausting.

But there may be another consequence that's even easier to overlook.

Imagine dinner at a noisy restaurant.

Everyone is laughing.

Two conversations are happening at once.

You catch half the words.

You miss the joke.

You ask someone to repeat themselves.

Then you lose the thread again.

Eventually...

staying home becomes easier.

This is one reason researchers are interested in the relationship between hearing loss, social isolation and cognitive health.

Hearing loss doesn't necessarily make someone consciously decide:

I'm going to become less social.

The process can be much quieter than that.

A restaurant becomes tiring.

A group conversation becomes frustrating.

A phone call becomes harder.

And gradually, opportunities for social and cognitive stimulation can shrink.

You don't need to wait until the television is unbearably loud.

Pay attention if you increasingly:

struggle to follow conversations in noisy places

feel that people are mumbling

ask people to repeat themselves

turn the television up higher than others prefer

have difficulty understanding someone when you can't see their face

or feel unusually tired after long conversations

None of these automatically means you have significant hearing loss.

But persistent changes are worth noticing.

Hearing loss isn't simply something researchers think we should accept as an unavoidable inconvenience of aging.

The Lancet Commission specifically recommends reducing harmful noise exposure and making hearing aids accessible to people with hearing loss. It also reports that evidence that treating hearing loss can reduce dementia risk has strengthened since its previous report.

That doesn't mean hearing aids are a guaranteed way to prevent dementia.

Dementia has many causes and risk factors, and association is not the same thing as causation.

But it does change how we should think about hearing.

Protecting your hearing isn't only about protecting your ears.

It may help preserve your ability to participate.

To communicate.

To stay connected.

And to keep engaging with a complicated, noisy world.

If you've noticed that understanding speech has become harder - particularly in noisy environments - don't wait until hearing loss becomes severe before getting it checked.

And regardless of your age, protect the hearing you have now.

Repeated exposure to harmful levels of noise is one of the things we can actually do something about.

Because losing hearing doesn't necessarily make the world silent overnight.

Sometimes...

it simply makes your world a little smaller at a time.

Stay curious,

David

Founder, Longevity Enthusiasts