Bone Loss Starts in Perimenopause, Not After Menopause
Day 16 of the 30-day Perimenopause Series.
The Scan Nobody Ordered in Time
A woman in her early sixties puts a hand out to catch herself on a curb and breaks her wrist. The bone scan that follows is the first one she has ever had, and it shows osteoporosis. She is stunned. Nothing hurt. Nothing warned her. She eats well. She walks every day. What she wants to know, sitting there with the report, is when exactly this happened to her.
The honest answer is that a great deal of it happened between about forty-five and fifty-three — during the years she was being told her labs looked fine and her symptoms were probably stress.
You do not lose bone at menopause. You lose bone in perimenopause. By the time your period stops, a decade of loss is already done. Start now.
What the Timeline Actually Looks Like
Bone is not scaffolding. It is living tissue that is torn down and rebuilt continuously — cells called osteoclasts dissolve old bone, cells called osteoblasts lay down new. In a healthy young adult those two crews stay roughly matched. Peak bone mass arrives somewhere in the late twenties, and through the thirties there is a slow, unremarkable drift downward that nobody notices and nobody needs to.
Then, in a window of roughly three years that straddles the final menstrual period — beginning about a year before it and continuing two or so years after — the drift becomes a drop. In the Study of Women's Health Across the Nation, which followed women through the transition rather than picking them up afterward, spine bone density fell on the order of two percent per year during that window, with the hip falling somewhat more slowly. Across the whole transition, cumulative loss at the spine ran to about ten percent.
And the acceleration begins earlier than that window. Measurable loss is already underway in late perimenopause — while cycles are still happening, just irregular and unpredictable. Which produces the sentence I most want women to take from this post: the fastest bone loss of a woman's life happens while she still has periods.
Why Estrogen Was Holding the Line
Estrogen's job in bone is restraint. It holds the demolition crew in check — largely by keeping a signaling molecule called RANKL, which recruits and activates osteoclasts, in balance with osteoprotegerin, the decoy that blocks it. When estrogen falls, RANKL signaling rises, osteoclasts are recruited faster and live longer, and resorption starts running ahead of formation.
That distinction matters. This is not slow wear from decades of use. It is a change in signaling — an instruction to break down faster than you build — and it arrives on a hormonal timeline, not a chronological one.
Two things compound it. Rising FSH and a low-grade inflammatory shift both tilt remodeling further toward resorption. And the same hormonal change is quietly costing you muscle at the same time — which means the mechanical pull on bone that tells it to stay dense is weakening in exactly the years bone most needs the signal. That is tomorrow's post, and it is not a coincidence that these two sit side by side.
The Heart Belongs in This Conversation
Women with low bone density have higher rates of cardiovascular disease than women without it. That association is observational and should be held carefully — low bone density does not cause heart disease, and nobody should read a bone scan as a cardiac test. But the overlap is not random. Estrogen withdrawal, low-grade inflammation, vascular calcification, and a drop in physical loading are shared soil for both.
The practical consequence is genuinely good news. The interventions that protect the skeleton in this decade are, almost item for item, the interventions that protect the heart: strength work, enough protein, adequate vitamin D, not smoking, sleep, blood pressure, staying loaded and moving. Stronger bones and a healthier heart are not two separate projects competing for your attention. They are largely the same one.
Why Almost Nobody Catches It
Routine bone density screening in the United States is recommended for women beginning at sixty-five, and earlier only for postmenopausal women under sixty-five whose risk, by formal assessment, is comparable. There is a defensible logic to that threshold at a population level. But look at what it means for the individual woman: the decade in which she loses bone fastest is, for most women, an unscreened decade. The first measurement she gets is taken after the event it was meant to warn her about.
Nothing else fills the gap, because bone loss produces no symptoms. There is no ache, no stiffness, no sign. The first symptom of osteoporosis is very often the fracture. And the perimenopausal complaints that do get clinical attention — the sleep, the mood, the cycles — rarely prompt anyone in the room to say the word bone.
What Accelerates It
Some women lose bone in this window faster than others. These are the histories that raise the stakes and, in my view, justify a conversation well before sixty-five.
A history of missed or absent periods — athletic amenorrhea, years on a very low body weight, or an eating disorder, including one that was never named or diagnosed. Bone built in the teens and twenties is bone you carry for life, and time spent without estrogen then is subtracted from the reserve you draw on now.
Low body weight or a small frame, and rapid weight loss from any cause — including medication-driven weight loss, which is why yesterday's post kept returning to muscle and bone.
Smoking, and alcohol beyond modest amounts.
Glucocorticoids — even intermittent courses, and certainly ongoing use. Also some anticonvulsants, long-term proton pump inhibitors, and thyroid replacement dosed higher than it needs to be.
Long-term SSRI use, which in observational data is associated with modestly lower bone density and higher fracture risk. Read that as a reason to protect bone deliberately alongside the medication — not as a reason to stop something that is holding your life together. That decision is never made from an internet article.
Undiagnosed celiac disease or another malabsorption problem, and inflammatory conditions like rheumatoid arthritis.
A parent who broke a hip, and early menopause — surgical or spontaneous — which simply starts the clock sooner.
A life with no meaningful loading in it. Bone maintains what it is asked to carry, and a desk and a daily walk are not asking much of it.
What Actually Builds Bone
Here is the part women are rarely told plainly: walking is wonderful for you and it does not build bone. Bone adds density in response to loads meaningfully greater than what it already handles. A daily walk maintains the status quo of a body that already walks daily. It is not a stimulus.
Resistance training that gets progressively heavier is the closest thing there is to a bone-building prescription. The LIFTMOR trial put postmenopausal women with low bone mass through supervised high-intensity resistance and impact training twice a week for thirty minutes and improved spine and hip density — in a group that had been told for years to be careful. Heavy is the mechanism. Careful, indefinitely, is how bone is lost.
Impact, in small doses. Hopping, skipping, stepping down off a stair. Brief and frequent beats long and occasional — bone responds to the first few loads of a session and then stops listening.
Protein, because roughly a third of bone by volume is a collagen protein matrix. Calcium is the mineral laid into the frame; protein is the frame. Midlife women under-eat it routinely.
Calcium in the range of a thousand to twelve hundred milligrams a day, food first — dairy, sardines, tinned salmon with bones, tofu set with calcium, greens, fortified foods. Supplements are for closing a gap you have actually measured, not for insurance.
Vitamin D, checked rather than guessed. Calcium without adequate vitamin D is poorly absorbed, and a 25-hydroxy vitamin D level is an inexpensive, ordinary lab.
Hormone therapy, where it is appropriate for the individual woman. It is FDA-approved for the prevention of postmenopausal osteoporosis, and it is the one intervention that addresses the actual mechanism rather than compensating for it. Whether it is right for you is a real conversation with someone who knows your history — and it is the subject of Day 20.
Stopping smoking and holding alcohol down, both of which act directly on bone rather than only on general health.
The Psychiatric Piece
This is my lane, so I will name what sits inside it. Sustained depression and chronic stress travel with elevated cortisol, and cortisol suppresses bone formation — which is part of why depression has been associated with lower bone density independent of medication. Poor sleep disturbs the remodeling cycle. A restrictive eating history, even a long-ago and unnamed one, shows up decades later in a scan. And long-term antidepressant use belongs in the risk conversation, not because the medication is the enemy but because nobody is having the conversation at all.
There is also a pattern I see constantly in this age group: the woman carrying a household, aging parents, and a job, who eats last and least, who has not lifted anything heavier than a laundry basket in fifteen years, and who has been told that self-care is a bath. Her bones are keeping a record of that.
Whole-Person Steps
Do not wait until sixty-five to think about your skeleton. Ask your clinician for a formal fracture risk assessment now; the standard tool takes a few minutes in the room.
Ask directly whether your history justifies an earlier bone density scan — parental hip fracture, low body weight, steroid use, thyroid disease, celiac, an amenorrhea or eating disorder history, long-term SSRI or acid-suppressing medication, early menopause, or rapid weight loss.
Get a 25-hydroxy vitamin D level rather than assuming. While you are at it: calcium, thyroid function, and celiac screening if there is any reason to suspect it.
Start resistance training this month, not in January. Two sessions a week, and heavier over time — the progression is the point, and a few sessions with someone who can teach you to load safely is money well spent.
Track protein and calcium honestly for three days. Most women are genuinely surprised, and you cannot fix a number you have never looked at.
If you are considering hormone therapy, ask specifically what it does for bone. It is frequently discussed only in terms of hot flashes.
If you are losing weight quickly for any reason, build the bone and muscle protection into the plan from day one rather than discovering the cost later.
If You Are in Utah
At Integrative Mind Body Psychiatry, I treat women in hormonal transition with the whole picture in front of me — mood, sleep, hormones, nutrition, eating history, medications, and what you want your body to be able to do at seventy. Bone belongs in a psychiatric conversation, because so much of what shapes it lives there. Telehealth for adults, adolescents, and women in hormonal transitions across Utah. Insurance accepted through Headway. Learn more at integrativemindbodypsychiatry.com.
For educational purposes only. Not a substitute for individualized medical advice, and not a recommendation for or against any medication, supplement, or screening test for any individual — those decisions belong to you and the clinician who examines you. Bone loss rates across the menopause transition derive from the Study of Women's Health Across the Nation; exercise findings from the LIFTMOR trial in postmenopausal women with low bone mass. Associations noted between bone density and cardiovascular disease, and between antidepressant use and fracture risk, are observational and do not establish cause.
Tomorrow: Day 17 — Why You Need Muscle More Than Cardio Now.
Respectfully, and with real care,
Beth Makar, RN, Dual-MSN, PMHNP-BC
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