Most of us think of bone density as a concern for broken hips and stooped posture. But a new study from Johns Hopkins University suggests that thinning bones may travel alongside something else: faster changes in the brain and a quicker slide in thinking skills.
Key Takeaways
- People with lower spinal bone density showed faster declines in thinking skills over time, according to a study of 715 adults published in the journal Radiology in September 2026.
- Lower bone density was also linked to signs of wear in the brain’s white matter, the wiring that connects different brain regions, in areas involved in attention, working memory and planning.
- The researchers stress this doesn’t mean weak bones cause cognitive decline. Both may stem from shared problems such as insulin resistance, unhealthy cholesterol levels and the hormonal shifts of menopause.
- Bone density was measured from routine chest CT scans using artificial intelligence, which could one day turn scans people already get into an extra health check.
- Protecting your bones and your brain often involves the same habits, including exercise, a healthy diet and managing blood sugar and cholesterol.
What the study found
The researchers used data from the Multi-Ethnic Study of Atherosclerosis (MESA), a long-running U.S. study that follows adults from diverse backgrounds. Participants had chest CT scans at the start of the study. Using an AI tool developed in their lab, the team measured bone density in the spine from those scans. Years later, participants had brain MRI scans and repeat thinking tests.
Among the 715 people with complete data, those with lower bone density at the start:
- Showed a faster decline in overall thinking skills on repeat testing.
- Built up more white matter “hyperintensities,” bright spots on MRI that signal damaged tissue, in the corpus callosum. That’s the thick band connecting the brain’s two halves, and it supports attention, working memory and executive function (planning, organizing and decision-making).
- Had a steeper loss of white matter integrity in another region involved in executive function.
Both kinds of white matter damage have been linked in earlier research to cognitive decline and a higher risk of dementia.
Why bones and brains might age together
The researchers don’t think weak bones directly damage the brain. Instead, they suspect bone and brain decline share common causes. Insulin resistance (an early step toward type 2 diabetes), abnormal cholesterol levels and the drop in estrogen during menopause can all affect both bone strength and the small blood vessels that keep the brain’s white matter healthy.
In that sense, low bone density may act less like a cause and more like a signal that the body’s aging processes are moving faster than they should.
What the study can’t tell us
This was an observational study, so it shows a link, not cause and effect. Although 2,086 people had their bones measured, only 715 had the brain scans and thinking tests needed for the analysis, and even fewer had repeat brain scans. The study also didn’t track whether participants went on to develop dementia. The researchers say much more research is needed before bone density could be used to screen for cognitive decline.
What you can do
The good news is that many of the habits that protect your bones also protect your brain:
- Stay active. Weight-bearing exercise like walking, plus strength training, builds bone and benefits brain health and blood flow.
- Get enough calcium and vitamin D, ideally from food first. Women over 50 generally need about 1,200 mg of calcium a day, and adults need 600 to 800 IU of vitamin D depending on age.
- Manage blood sugar and cholesterol, which may be part of the link between bones and brain.
- Don’t smoke, and limit alcohol, both of which weaken bones and harm blood vessels.
- Ask about a bone density test. Women 65 and older should be screened for osteoporosis, as should younger women with risk factors. Men should ask their doctor whether testing makes sense for them.
- Bring up memory changes with your doctor, especially if you’ve been told you have low bone density.
This isn’t a substitute for medical advice. Talk to your doctor about what’s right for you.
Sources:
- Momtazmanesh S, Demehri S, et al. Radiology, September 2026. doi:10.1148/radiol.260656
- Radiological Society of North America release via News-Medical. September 22, 2026.