The Perimenopause Pivot: The Quiet Bone Crisis

Nobody talks about bones until one breaks

You may have heard my story. Three years ago my mom fell and broke her hip while walking at the gym. Not running. Not doing box jumps. Walking. On a flat surface. She went down and everything changed. For her. For me. For the way I think about what we owe ourselves and each other when it comes to women's health.

She's okay now. But "okay" after a hip fracture in your 70s is a relative term. The surgery. The rehab. The fear of falling again that rewires your entire relationship with movement. The independence you lose and may never fully get back. I watched it all, and it radicalized me. It's part of the reason I'm so passionate about getting the word out and educating women and doctors alike. 

I don't want that for you. I don't want that for your mom. And I really don't want us to keep treating bone health like something only "old people" need to think about.

The silent dismantling

Here's what most women don't realize. Bone loss doesn't start at 70. It doesn't start at menopause. Bone loss begins in earnest 2-3 years BEFORE the final menstrual period, during perimenopause. Women can lose up to 20% of their bone density in the five to seven years surrounding menopause. That is not a gentle decline. That is a structural crisis happening inside your body without a single symptom to show for it.

Estrogen is the reason. Estrogen normally suppresses osteoclasts, which are the cells that break down bone. Think of your skeleton as a house that's constantly being remodeled. Osteoclasts are the demolition crew. Osteoblasts are the construction crew. When estrogen is present, it keeps the demolition crew in check so the construction crew can keep up. When estrogen declines, the demolition crew goes unsupervised. They start tearing down walls faster than anyone can rebuild them.

Progesterone and testosterone also have roles in bone maintenance. 

You don't feel this happening. There's no pain. No warning sign. No symptom that tells you your bones are thinning until the day you fall and something breaks that shouldn't have broken. That's why I call it the quiet crisis. It's loud in its consequences and completely silent in its progression.

The vitamin D trap

Most women have heard they should take vitamin D. That's good advice as far as it goes. But here's the twist that most people miss and most doctors don't mention.

Vitamin D helps your body absorb calcium. Great. But it doesn't tell calcium where to go. Without vitamin K2, calcium can end up deposited in your arteries instead of your bones. Read that again. The supplement you're taking to protect your bones could, in theory, contribute to arterial calcification if you're not pairing it with K2.

Vitamin D3 and K2 work together. D3 opens the door and lets calcium in. K2 is the traffic cop that directs it to your bones (where you want it) and away from your arteries (where you absolutely do not). Taking one without the other is like hiring movers but not telling them which room the furniture goes in. Things end up in the wrong place.

What actually helps

Resistance training and impact exercise are non-negotiable for bone health (think: jumping jacks). Your bones respond to mechanical loading. When you lift heavy things, when you jump, when you stomp, you send a signal to your bones that says, "We need to be stronger." Your bones listen. They build. Walking is wonderful for many things, but it does not provide enough stimulus to meaningfully build bone density. 

Adequate protein matters more than most people realize. Bone is 50% protein by volume. If you're under-eating protein (and most midlife women are), you're not giving your skeleton the raw materials it needs to rebuild. Aim for at least one gram per pound of your ideal body weight. 

Limit alcohol. I know. Nobody wants to hear this one. But even moderate drinking impairs osteoblast function. Those are your bone-building cells, the construction crew. Alcohol tells them to take the day off. Regularly.

Balance training is unsexy, but critically important. Fall prevention is bone fracture prevention. My mom didn't break her hip because her bones were weak (although they were). She broke her hip because she fell. If she hadn't fallen, those weakened bones would have kept carrying her just fine. Train your balance. It's not glamorous. It might be the most important thing on this list.

And get tested early. Ask for a DEXA scan baseline in perimenopause, not just after menopause when you've already lost a significant percentage of your bone density. You can't manage what you don't measure, and waiting until you're postmenopausal to get a baseline is like checking the oil after the engine seizes.

Where your HOP Box comes in

Vitamin D3 (2500 IU) is essential for calcium absorption. Most midlife women are deficient, and deficiency is so common it's almost the default. You cannot build bone without adequate D3. Your body needs it to even access the calcium you're eating.

Vitamin K2-MK7 (25mcg) is the traffic cop. It activates a protein called osteocalcin, which directs calcium into your bones. It also activates matrix GLA protein, which keeps calcium out of your arteries. This is the missing piece in most women's supplement routines. They're taking D3 without K2 and wondering why their bone density isn't improving.

Magnesium glycinate (100mg) is required for vitamin D activation. Your body can't even use the D3 you're taking without adequate magnesium. On top of that, magnesium is directly incorporated into your bone crystal structure. It's literally a building material. And most women are deficient.

NR (nicotinamide riboside, 250mg) supports NAD+, which plays a role in osteoblast function. Your bone-building cells need energy to do their job. NAD+ is part of that energy supply. As NAD+ declines with age, so does your capacity to build new bone. Supporting NAD+ levels supports the construction crew.

The bottom line

My mom's hip fracture didn't have to happen. Not like that. Not without warning. The bone loss that led to it started decades before the fall, during a window of time when intervention could have made all the difference. Nobody told her. Nobody tested her. Nobody connected the dots between her declining estrogen and her thinning skeleton.

I can't go back and change that for her. But I can make sure you know. Bone loss in perimenopause is fast, silent, and significant. It is not an old-person problem. It is a right-now problem. And the window to do something about it is open today.

Don't wait for the fall.

Now, HOP to it!

Dr. Amy Killen & the HOP Team