Research by ICMR-NIN, Stanford, and Karolinska Institute finds nearly 40 per cent of surveyed adults in Telangana face elevated cognitive decline risk, with rural populations disproportionately affected.
A significant new study has established a direct association between micronutrient deficiencies and elevated dementia risk among middle-aged and older adults in India, with researchers warning that the country’s widespread nutritional gaps could translate into a substantial and largely preventable cognitive health burden in the decades ahead.
The study, conducted by the Indian Council of Medical Research’s National Institute of Nutrition in Hyderabad in collaboration with Stanford Center for Innovation in Global Health in the United States and the Karolinska Institute in Sweden, has been published in The Lancet Regional Health – Southeast Asia. It is among the first studies of its kind to examine the relationship between micronutrient status and dementia risk within an Indian population using a culturally adapted assessment framework.
Scale and Methodology
The community-based cross-sectional study enrolled 570 adults between 40 and 80 years of age from both rural and urban settings in Telangana. Researchers used a culturally adapted version of the Cardiovascular Risk Factors, Ageing and Incidence of Dementia score — a widely used dementia risk assessment tool — and evaluated its relationship with participants’ micronutrient profiles, dietary intake, and dietary diversity.
The adaptation of the assessment tool for Indian conditions is itself a methodological contribution, addressing a long-standing gap in dementia research for South Asian populations, which have historically been underrepresented in global cognitive health studies.
Key Findings
The study found that nearly 40 per cent of participants were classified as having a higher predicted risk of dementia. Those in the higher-risk group demonstrated significantly poorer nutritional status across multiple indicators. Deficiencies of vitamins D, B2, B6, and B12 were markedly more prevalent among individuals with elevated dementia risk scores. These individuals also showed lower dietary diversity, higher consumption of saturated fats and reduced intake of unsaturated fats.
The prevalence of vitamin B12 deficiency is a particularly salient finding in the Indian context, given the country’s large vegetarian population, for whom this nutrient is not naturally available through plant-based foods alone. Vitamin D deficiency, paradoxically common despite India’s tropical climate, has previously been associated with cognitive decline in international research, and this study reinforces that association in an Indian cohort.
Rural Vulnerabilities
Vitamin deficiencies were found to be more prevalent among rural participants than their urban counterparts, pointing to rural-specific vulnerabilities that may be contributing to elevated dementia risk.
This finding has material implications for public health planning. With rural India accounting for the majority of the country’s population, and with existing healthcare infrastructure in many rural areas already under strain, the prospect of an accelerating dementia burden concentrated in these communities demands urgent policy attention.
The study also found that diets rich in micronutrients — particularly those emphasising fruits and vegetables — were associated with a lower burden of dementia risk factors, suggesting that targeted dietary interventions could offer a cost-effective and scalable prevention strategy.
Researchers Emphasise Modifiability
Speaking on the significance of the findings, Dr G. Bhanuprakash Reddy, Scientist G at ICMR-NIN and lead investigator, said the study highlights that micronutrient status is closely linked with the burden of dementia risk factors among Indian adults, and that nutrition — particularly micronutrient adequacy and dietary diversity — represents a modifiable factor that can be targeted through public health interventions.
The emphasis on modifiability is central to the study’s public health relevance. Unlike age, genetics, or family history, nutritional status can be meaningfully altered through individual behaviour change, food fortification programmes, and targeted supplementation — all of which are within the reach of existing government health schemes.
Dr Bharati Kulkarni, Director of ICMR-NIN, said the study provides important evidence that nutritional factors, especially micronutrient status, should be integrated into dementia prevention strategies going forward.
The Larger Context
India currently has an estimated 8.8 million people living with dementia, a figure projected to more than double by 2050 as the population ages. The country has yet to adopt a national dementia plan, and awareness of the condition — both among the public and within primary healthcare settings — remains limited.
Against this backdrop, a study demonstrating that nearly four in ten surveyed adults already carry an elevated dementia risk, and that this risk is closely tied to correctable nutritional deficiencies, represents a finding of considerable public health urgency. It also underscores the need for longitudinal studies that can track whether correcting these deficiencies over time translates into measurably reduced rates of cognitive decline in Indian populations.
-Rashmi Kumari
