Bone drug linked to 24% lower dementia risk in older adults
A medication widely used to strengthen bones may also protect the aging brain. In a study of over 120,000 older patients, researchers found that a common osteoporosis drug was associated with a significantly lower risk of developing dementia.
Osteoporosis and dementia often affect the same people: older adults, more frequently women, with low physical activity. Previous research by the same HKUMed team had already established that osteoporosis and fractures are independent risk factors for dementia. Researchers at the University of Hong Kong analyzed electronic health records from more than 120,000 patients aged 60 and older, all of whom had osteoporosis or fragility fractures, to investigate which treatments were linked to lower dementia rates.
Nitrogen-containing bisphosphonates stand out
Patients taking nitrogen-containing bisphosphonates (NBPs), such as alendronate or zoledronate, had a 16% lower risk of developing dementia compared with patients receiving no osteoporosis medication at all. When compared with other bone drugs, the gap grew to 24%. The study was published in Alzheimer’s & Dementia. Women and patients who had experienced hip fractures appeared to show the strongest associations.
Because this study only tracked what happened to people in real life without testing a treatment directly, the findings cannot establish cause and effect. The researchers emphasize that further studies are needed to determine whether NBPs can directly prevent or delay dementia. Still, their estimate is striking: treating 48 patients with NBPs for five years could potentially prevent one case of dementia.
A practical angle for a rapidly aging world
The appeal of this line of research lies in its practicality. NBPs have been available for decades, are widely prescribed, and are affordable. If future research confirms their protective effect, no new drug needs to be developed. With an estimated 139 million people projected to live with dementia by 2050, that is not a minor observation.
Search terms to explore further: bisphosphonate brain protection, dementia prevention bone drugs, bone loss cognitive decline