“You can do everything on the standard bone health checklist and still have bones that are losing ground — if these background factors are quietly accelerating the loss.”
Nicole was 59 and doing everything right.
She practiced yoga three times a week. She took her calcium and vitamin D without fail. She walked her dog every morning and had been lifting weights twice a week for almost two years.
When her DEXA scan came back showing borderline osteopenia, she wasn’t entirely surprised — she knew bone loss was part of aging. But she wasn’t alarmed either. Her T-score wasn’t dramatically low, and she felt strong.
Then her functional medicine doctor ordered something most physicians never request: a bone turnover marker panel — two simple blood tests called CTX and P1NP.
Unlike a DEXA scan, which is a snapshot of how much mineral is in your bones right now, these blood markers reveal what your bones are actually doing at this moment.
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CTX measures bone resorption — how actively your body is breaking bone down. P1NP measures bone formation — how actively it’s building back up.
Nicole’s results showed that her bone resorption wasn’t simply “elevated,” as you might expect during menopause — it was running above the upper end of even the normal postmenopausal range.
At the same time, her P1NP (the bone formation marker) was relatively low. In other words, her body was breaking down bone faster than you’d expect from normal, menopause-related bone loss — and rebuilding it more slowly.
Her doctor went through the checklist — calcium, vitamin D, diet — all fine. Then came the questions Nicole hadn’t expected: How would you describe your stress level over the past few years? How do you breathe when you’re anxious? How’s your sleep?
The answers, as it turned out, were the beginning of a very different conversation about bone health.
The Bigger Picture Most Bone Health Conversations Miss
We’ve been told the story of bone health in a fairly consistent way for three decades: build calcium reserves early, get enough vitamin D, do weight-bearing exercise, take medication if your T-score is low enough. All of that is true and worth doing.
But here’s what the research is increasingly revealing: your bones don’t operate in isolation from the rest of your biology.
They are living tissue, constantly remodeling themselves in response to the full environment of your body — including your hormones, your nervous system, the quality of air moving in and out of your lungs each day, and yes, how much stress you’ve been carrying.
After menopause, once the rapid early transition passes, bone loss continues at roughly 1–1.5% per year.(3) And unfortunately, lifestyle factors that keep the body’s bone-breakdown biology in overdrive can match or exceed that rate — quietly, invisibly, even when you’re exercising faithfully.
Strength training can help build bone — and it is important. But for many women, reducing the factors that accelerate bone loss may be just as important and powerful a strategy as adding the factors that promote gain.
Yet this is a conversation most of us never have with our doctor, because blood tests that measure bone resorption rates are not part of standard osteoporosis screening.
Your Nervous System Is Talking to Your Bones — and You Can Change What It’s Saying
So how can you make a difference? Think of your body as having a built-in alarm system. When you sense danger — a threat, a deadline, a conflict — your brain sounds the alarm and floods your body with cortisol.
Yes, you’ve heard of it — cortisol is the infamous stress hormone. In normal amounts, it helps mobilize a healthy stress response in the body. The problem starts when the alarm never quite turns off.
Chronic, low-grade stress — the kind that hums along in the background of a busy life — keeps cortisol elevated day after day.
And what most women don’t know is that chronically elevated cortisol has a very direct effect on your bones. It tells the cells that build bone to slow down, and it tells the cells that break bone down to speed up.
At the same time, it interferes with how well your intestines absorb calcium — so less of what you’re taking actually makes it into your skeleton.
Here’s a striking way to see how powerful this effect is: the most common form of secondary osteoporosis isn’tcaused by aging or menopause. It’s caused by cortisol-like medications — prednisone, cortisone — that doctors prescribe for conditions like asthma or arthritis. Those drugs work by mimicking cortisol. The bone loss they cause is essentially the same bone loss that chronic stress causes, just faster and more visible.
Chronic stress also dials down estrogen — which for postmenopausal women is already lower than it used to be — and triggers low-grade inflammation that further interferes with the bone-rebuilding process.(4)(5) Women who experience depression or anxiety have been found to have lower bone density at multiple sites, and elevated cortisol is a key part of why.
In short: your body can’t be in repair mode and alarm mode at the same time. When the stress response is running, bone rebuilding takes a back seat.
The good news is that in the same way you can influence bone building, you can influence cortisol levels.
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When you bring your nervous system into a calmer, more settled state, cortisol drops, inflammation quiets, and the conditions for bone formation improve.
A 2024 meta-analysis found that mind-body exercise in perimenopausal and postmenopausal women produced measurable improvements in bone density — alongside real reductions in anxiety, depression, and fatigue. Those outcomes aren’t separate. They share the same root.
Every Breath You Take Is a Chance to Feed Your Bones
This is the piece of the bone health story that surprises people most — every breath you take can affect your bone health.
Breathing affects your bones through several distinct pathways, and understanding them changes the way you think about what’s happening every time you take a full, unhurried breath.
The Oxygen Pathway
Bone-building cells need oxygen to do their job. When oxygen supply is chronically low — from shallow breathing, poor posture, age-related decline in lung capacity, or disrupted sleep — bone breakdown can outpace bone building.
Research shows, for example, that people with obstructive sleep apnea, who experience repeated drops in blood oxygen during sleep, have significantly lower bone density than those without it.
Add to that the fact that lung function declines gradually with age — forced vital capacity falls by roughly 0.2 liters per decade, driven partly by postural changes in the rib cage and not just aging itself — and you get a clearer picture of how a loss of breathing capacity can be one factor accelerating long-term bone loss.
The Calcium Pathway
Chronic shallow or upper-chest breathing — the pattern many of us default to under stress — can shift blood chemistry in ways that prompt the body to draw on calcium to keep its acid-base balance in check, with some of that calcium ultimately lost in the urine.
This is subtle and cumulative. It won’t show up as a cause on a DEXA report, but clinicians who study breathing patterns note it is particularly common in people who tend to be driven, perfectionistic, or chronically busy — which describes a lot of those of us who are working hardest to protect our health.
The Feedback Loop
Stress leads to shallow breathing. Shallow breathing signals the nervous system that something is wrong, which increases the stress response, which raises cortisol, which harms bone — and the cycle continues.
But the reverse is equally true. Slow, full breathing calms the nervous system, lowers cortisol, and creates the internal conditions that support bone formation.
Studies have shown that breathwork significantly reduces stress and anxiety, with slow-paced breathing the most effective approach. The breath isn’t a relaxation bonus. It’s a direct line into the biology of bone rebuilding.
Sleep Quality
The body’s primary bone-rebuilding window happens during sleep. Chronic poor sleep disrupts this cycle. Research suggests that sleep disturbance is associated with increased fracture risk, through a combination of oxygen disruption, inflammation, and altered bone metabolism.
If your bone loss seems larger than your age and lifestyle would explain, it’s worth asking your physician about your Z-score (the number comparing you to women your own age, not to a 30-year-old) and whether a secondary-causes workup makes sense. More on this in our next article.
Moving Beyond the Standard Bone Health Checklist
You can do everything on the standard bone health checklist and still have bones that are losing ground — if these background factors are quietly accelerating the loss.
Fortunately, according to the research, adding a mind-body exercise program can help safeguard your bones against the insidious, slow bone loss triggered by high cortisol levels.
And you don’t have to give up your usual strength training program. A 2026 network meta-analysis found that mind-body exercise combined with resistance training produced the strongest improvements in bone mineral density in postmenopausal women — stronger than either approach alone.
The reason makes intuitive sense: the nervous system environment you bring to every workout shapes whether your bones actually respond to the stimulus. A body in chronic stress mode — high cortisol, shallow breathing, poor sleep — is less able to convert exercise into bone adaptation.
The practices that address these factors are simple, accessible, and can begin today.
Subscribers can find a step-by-step guide below.
Age Strong for Life is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.
⭐ How to Measure the Stress Hormone that’s Quietly Shaping your Bones
And a simple breathing practice to rebuild the muscles that make deep breathing possible
If the science above has you wondering how the cortisol-bone-breath story is actually playing out in your own body, there are two concrete things you can do this week.
The first is to get an accurate picture of your cortisol. The second is to start rebuilding the specific muscles that let you take a full, deep breath — muscles that quietly weaken with age and, in doing so, help lock in the shallow-breathing pattern this article has described.
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