New Findings on Dementia Prevention: A 2026 Update on the Lancet Risk Factors

Two years later, research is still expanding upon this foundation.  New studies are strengthening our knowledge of how certain risk factors influence dementia risk and, in some cases, providing stronger evidence for why they matter.  In this update, we focus on three areas where some of the most significant results have emerged since the 2024 Lancet report:  cardiometabolic health, hearing loss, and loneliness. 

Cardiometabolic Health: Moving from Association to Causation 

One of the biggest challenges in dementia research is determining whether a risk factor is contributing to disease development (i.e. causation) or simply appearing alongside it.  Researchers are able to identify associations relatively quickly, but establishing causation can require years of evidence from multiple types of studies. 

A large 2026 genetic study is gathering notable attention for this reason.  It found stronger evidence that both hypertension (high blood pressure) and elevated body mass index (BMI) — a measure commonly used to determine total body fat based on height and weight — may not only be associated with dementia development but play a direct causal role in it.²  This discovery reinforces the idea that cardiovascular and metabolic health are closely linked to brain health and function.  It also coincides with other dementia risk factors highlighted in the Lancet Commission report, including diabetes and high LDL cholesterol, which often occur alongside high blood pressure and excess body weight. 

These outcomes strengthen the case for paying attention to metabolic health and the warning signs of metabolic syndrome.  As we discussed in our article, Is Your Metabolic Health Worsening Your Brain Health? Some Thoughts to Consider, these risk factors rarely exist in isolation. 

Action Steps:  What could be most encouraging about this research is that we can do something about these risk factors.  They don’t require complicated tests and have been applied in doctor’s offices and homes for decades.  Blood pressure can be monitored and managed, and weight can be reduced through nutrition, physical activity, and medical aid when necessary.  Unlike many aspects of aging, cardiometabolic health is highly modifiable, providing us significant opportunities to support both overall health and long-term cognitive ability at the same time. 

Say What?  Hearing Loss Continues to Surprise Researchers 

When many people think about dementia prevention, hearing loss is not usually the first risk factor that comes to mind.  Yet it’s become a consistently supported finding in dementia research. 

Hearing loss has been found to be associated with approximately a 30% greater risk of developing dementia.  And this isn’t from just one study — it comes from a 2025 global meta-analysis that examined 49 studies involving nearly 10 million participants across different populations, healthcare systems, and study designs, demonstrating that the correlation bears substantial weight.³  

Now, researchers are also making progress in understanding why this connection exists.  Recent reviews suggest that hearing loss can increase the brain's cognitive workload as it works harder to process everyday sounds.  The brain may also receive less stimulation as neural networks involved in hearing and cognition become less active with declining hearing.  Furthermore, it can make social interactions more difficult, leading some people to withdraw from activities and relationships that help keep the brain engaged.⁴  

Action Steps:  This may sound like bad news; however, hearing loss is one of the simplest risk factors to address, thanks to the advances in hearing aid technology.  Modern hearing aids are smaller, more effective, and less noticeable than ever before, making early intervention more accessible to people in midlife as well as older adults.  Many clinics and hearing centers offer quick and simple assessments that can help identify potential hearing loss before it begins to significantly affect daily life.  As the evidence continues to grow, protecting your hearing may become one of the more practical steps you can take to support your brain.  And if you regularly use loud equipment, power equipment, or attend noisy events, make hearing protection a habit — earplugs and earmuffs are widely available and can help prevent noise-related hearing damage before it occurs.  

Why Loneliness Is Growing as a Major Brain Health Concern 

The Lancet Commission identified social isolation as one of the 14 modifiable risk factors for dementia, but recent research suggests the story may be even more complex. 

A large meta-analysis involving more than 600,000 individuals found that loneliness was associated with a 31% greater risk of developing dementia, and the association remained after researchers took into account both depression and social isolation.  In other words, loneliness appears to influence dementia risk independently rather than just reflecting depression or a lack of social contact.⁵  This is an important distinction — that loneliness and social isolation are not the same thing.  A person can be surrounded by family, friends, or coworkers and still experience a persistent feeling of disconnection or lack of meaningful relationships. 

These findings on loneliness have attracted considerable attention because it increases risk comparable to that of several well-established dementia risk factors like hearing loss, smoking, and physical inactivity.  At the same time, many public health experts are concerned that loneliness is on the rise, especially among younger generations, possibly due to lingering effects of the COVID-19 pandemic, increased social media use, and fewer opportunities for in-person interaction.⁶  

Action Steps:  The takeaway is not to panic, but to pay attention.  If you notice signs of loneliness in yourself, a family member, or even your children, prioritize meaningful connection.  Common signs can include withdrawing from social activities, feeling disconnected even when around other people, a loss of interest in hobbies or activities once enjoyed, or frequently feeling isolated or left out.  If these feelings persist, it may be helpful to discuss them with a healthcare professional, mental health counselor, therapist, or primary care provider.  Community involvement, shared activities, regular exercise, and strong personal relationships may all support emotional well-being — and how your brain functions in the long run. 

Why Isn't Nutrition One of the 14 Risk Factors? 

After reading about hypertension, obesity, diabetes, and metabolism, you might be wondering why diet and nutrition aren't specifically listed among the Lancet Commission's 14 modifiable risk factors. 

The likely answer is that nutrition is foundational to many of the risk factors already on the list. 

What we eat directly affects LDL cholesterol, blood pressure, body weight, blood sugar regulation, and overall metabolic health.  Clinically, one of the most effective ways to improve cardiometabolic health is through dietary change. 

As the Lancet Commission notes, eating a diet rich in fruits and vegetables and low in ultra-processed foods supports many aspects of long-term health.  Brain-healthy dietary patterns such as the Mediterranean and MIND diets emphasize foods that help reduce inflammation and support metabolic health, including fruits, vegetables, whole grains, legumes, fish, olive oil, and other nutrient-dense foods.  These patterns provide fiber, healthy fats, antioxidants, and bioactive compounds such as polyphenols.  As evidence connecting cardiometabolic health and dementia risk continues to grow, nutrition remains one of the most important tools in maintaining a healthy brain, all life long. 

Why These Findings Matter 

Since 2024, more studies in dementia prevention have begun to show a shift from association toward causation.  Researchers are becoming more confident that cardiometabolic factors such as hypertension and elevated BMI are not just accompanying dementia but actively contributing to its development.  At the same time, evidence shows that hearing loss and loneliness are important, modifiable risk factors. 

Fortunately, these are areas where change can be simple.  Blood pressure can be managed, metabolic health improved, hearing loss treated, and social connections strengthened.  The Lancet report helped identify where we should focus our efforts, and new research is helping us understand why these factors matter for each of us. 

Supporting Lifelong Brain Health 

NeuroReserve is a preventive healthcare company whose mission is to protect people from the growing epidemic of neurodegenerative disease and cognitive decline through evidence-based nutritional products and dietary guidance. 

We provide an array of food and nutritional products, including RELEVATE, a patented nutritional supplement based on the brain-healthy Mediterranean and MIND dietary patterns; Brain Health Kitchen Extra Virgin Olive Oil (BHK EVOO), a key component of brain-healthy nutrition; and REVANTA Creatine, designed to support brain energy and performance. 

References: 

1. Livingston, G. et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. The Lancet 404, 572–628 (2024). 

2. Nordestgaard, L. T. et al. High Body Mass Index as a Causal Risk Factor for Vascular-Related Dementia: A Mendelian Randomization Study. J. Clin. Endocrinol. Metab. 111, e1681–e1694 (2026). 

3. Readman, M. R. et al. Hearing loss as a risk factor for dementia: a systematic review and meta-analysis from a global perspective. Aging Ment. Health 29, 1831–1844 (2025). 

4. Broome, E. E. et al. Dementia and hearing loss: from risk to mechanisms and management. Frontiers in Dementia 5, (2026). 

5. Luchetti, M. et al. A meta-analysis of loneliness and risk of dementia using longitudinal data from >600,000 individuals. Nature Mental Health 2, 1350–1361 (2024). 

6. Fields, L. Why Loneliness Affects Young People More Often Than Older Adults. Cedars Sinai https://www.cedars-sinai.org/stories-and-insights/expert-advice/why-loneliness-affects-young-people (2023).