Weak bones are commonly associated with osteoporosis, fractures and problems with mobility. But researchers are more and more investigating whether poor bone health is associated with a higher risk of dementia, including Alzheimer’s disease.
Osteoporosis is associated with dementia risk in recent years. However, the evidence is not that having weak bones causes Alzheimer’s. Scientists are still exploring the biological pathways that may link bone and brain health.
What Does Recent Research Show?
A 2025 nationwide cohort study of 131,872 Korean women found that osteoporosis was associated with a higher risk of developing dementia, on average, over 10 years. The association was also observed for Alzheimer’s disease.
Related Articles
The researchers found that women with osteoporosis had a 14% higher adjusted risk of Alzheimer’s dementia compared with women with normal bone density.
Importantly, this was an observational study. It shows an association rather than proving that osteoporosis itself causes Alzheimer’s.
Why Could Bone and Brain Health Be Connected?
There are several possible explanations. Bone and brain tissues communicate through biological pathways (hormones, proteins and inflammatory processes).
Related Articles
A 2025 review explored the biological and genetic connections between osteoporosis and dementia. They identified pathways involving bone-remodelling proteins and signalling systems that may play a role in Alzheimer's disease and found some of them potentially implicated. However, many of those mechanisms have yet to be fully elucidated.
Alzheimer’s May Also Affect Bone Health
The relationship may work in both directions. Research has shown that people with Alzheimer’s disease can have lower bone mineral density.
A systematic review and meta-analysis found lower bone mineral density among older adults with Alzheimer’s compared to people without dementia. The quality of evidence was limited and researchers said more research is needed.
Lower physical activity, nutrition, frailty and other health problems associated with cognitive decline may also contribute to weaker bones.
Exercise May Matter for Both
Physical activity is crucial to maintaining muscle strength and bone health. It may also help in healthy ageing and cognitive function.
A 2024 systematic review also found that long-term exercise and multidomain interventions in older adults can be beneficial to cognitive health, although the evidence is mixed for each intervention type.
Regular movement is good for strength, balance and independence and might also help reduce falls and fractures.
How Can You Protect Bone and Brain Health?
Maintaining a healthy lifestyle can be considered for aging in general. Healthy ageing is linked to physical activity, good nutrition, avoiding smoking and managing diabetes and high blood pressure.
People with osteoporosis can ask a doctor about bone density testing. Those with persistent memory problems or changes to thinking should also be evaluated for medical conditions.
The Bottom Line
There is evidence that weak bones and Alzheimer’s disease may be related, but the relationship is complex. Osteoporosis should not be considered a cause of Alzheimer’s as of now based on the evidence in health care.
Bone health is still vital for preventing fractures and maintaining independence, and healthy habits are associated with physical and cognitive health and can be beneficial both physically and cognitively as people age.
Comments 0