Lower bone density in the spine is linked to faster cognitive decline and accelerated injury to the brain's white matter, according to a Johns Hopkins study published in Radiology.
The Research
Led by postdoctoral fellow Sara Momtazmanesh, M.D., and senior author Shadpour Demehri, M.D., professor of radiology at Johns Hopkins University, the team drew on data from the Multi-Ethnic Study of Atherosclerosis (MESA). They used a deep learning algorithm built in Dr. Demehri's lab to measure volumetric bone mineral density (vBMD) of the thoracic vertebrae directly from routine chest CT scans in 2,086 people.
From that pool, 715 participants had both bone density measurements and complete brain MRI plus longitudinal cognitive testing. The researchers tracked two imaging markers over time: white matter hyperintensities (bright patches on MRI signaling small vessel disease), with follow-up data for 408 participants, and fractional anisotropy (a diffusion tensor marker of white matter tract integrity), tracked in 405 participants.
Results showed that people with lower baseline spinal bone density experienced a faster drop in global cognition. Damage clustered in specific functional hubs: more white matter hyperintensities in the corpus callosum—a bridge supporting working memory, executive function, and attention—and steeper fractional anisotropy loss in the anterior limb of the internal capsule. As the authors emphasized, this is not evidence that bone loss causes dementia. Both may stem from shared metabolic aging mechanisms, including insulin resistance, dyslipidemia, and menopausal shifts.
Why It Matters
Bone health and brain health have long been studied in isolation, but this research suggests they may decline in parallel through common metabolic pathways. For anyone watching their cognitive health, that's practically useful: a routine chest CT already contains a hidden bone-density signal, and that signal tracks with brain changes years before symptoms would be obvious. It reinforces that whole-body metabolic health—not just brain games or genetics—shapes how we think as we age.
What You Can Do
- Ask your doctor whether your existing chest CT scans include vertebral bone density measurements you can track.
- Support metabolic health with regular aerobic and resistance exercise, which benefits both bone and brain.
- Discuss bone density screening with your physician, especially after menopause or with metabolic risk factors.
- Keep challenging your cognition with varied, adaptive tasks—and measure where you stand today.
Source: Neuroscience News
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