A study by India's ICMR-National Institute of Nutrition (ICMR-NIN, a leading government nutrition research body based in Hyderabad) has found a strong link between deficiencies in vitamins D, B2, B6, and B12 and a higher predicted risk of dementia among adults aged 40 to 80 in the southern state of Telangana. Of the 570 participants examined, nearly 40% showed elevated dementia risk, and these individuals consistently had poorer nutritional status and less diverse diets. The researchers, who published their findings in The Lancet Regional Health – Southeast Asia, say the results highlight nutrition as a key modifiable factor in dementia prevention, particularly as India's ageing population is expected to drive a sharp rise in dementia cases by 2050.