Modifiable risk factors
The Lancet Commission on Dementia Prevention identifies 12 potentially modifiable risk factors that together account for approximately 40% of worldwide dementia cases. Hypertension in midlife is the single most important modifiable risk factor — blood pressure control below 130/80 mmHg when tolerated reduces both stroke and dementia risk. Diabetes management, obesity reduction, physical inactivity, smoking, excessive alcohol consumption, depression, social isolation, air pollution exposure, hearing loss and low educational attainment all contribute to modifiable risk.
Many of these risk factors are prevalent in Nepal. Hypertension is frequently underdiagnosed and undertreated, particularly in rural areas. Diabetes prevalence is rising rapidly. Physical inactivity increases with urbanisation. Social isolation affects elderly populations, especially those living alone. Addressing these factors through public health measures and individual lifestyle modification represents the strongest evidence-based approach to cognitive decline prevention. Vascular risk management should begin in midlife — hypertension, diabetes and smoking in the 40s and 50s increase dementia risk decades later.
- Hypertension in midlife — most important modifiable risk factor for dementia
- Diabetes management — associated with increased dementia risk
- Physical inactivity — regular exercise reduces cognitive decline
- Smoking — each cigarette contributes to vascular brain damage
- Social isolation and depression — address through engagement and treatment
- Hearing loss — correction may reduce cognitive decline risk
Related: Cognitive Care → · Dr. Jitendra Knowledge Hub → · ICHD-3 Topic →
Evidence-based prevention strategies
Physical activity has the most robust evidence for cognitive preservation among lifestyle interventions. Regular aerobic exercise (at least 150 minutes of moderate-intensity activity per week) improves cardiovascular fitness, reduces blood pressure, aids weight management and promotes hippocampal neuroplasticity — the brain region critical for memory. The Mediterranean diet (rich in fruits, vegetables, whole grains, olive oil, fish and nuts) has the strongest dietary evidence for vascular and cognitive protection. Sodium reduction supports blood pressure control, and adequate hydration supports overall brain function.
Social engagement and cognitively stimulating activities build cognitive reserve — the brain's resilience to age-related or pathological change. Maintaining social connections, participating in community activities, learning new skills, reading, and engaging in meaningful occupation all contribute. Sleep optimisation is essential — chronic sleep disruption impairs memory consolidation and increases amyloid deposition. Hearing correction when needed reduces cognitive load. At Kathmandu Neurology Clinic, Dr. Jitendra Prasad Yadav (NMC 8029) provides personalised risk factor assessment and evidence-based prevention strategies at Durbar Marg, Opposite of Yak & Yeti Hotel.
- Regular aerobic exercise — at least 150 minutes of moderate-intensity activity per week
- Mediterranean diet — fruits, vegetables, olive oil, fish, whole grains, nuts
- Social engagement — community participation, meaningful occupation, learning new skills
- Sleep optimisation — consistent schedule, address sleep apnoea, limit screen exposure
- Cognitive stimulation — reading, puzzles, new skill acquisition
- Hearing correction — reduces cognitive load in those with hearing loss