Even in sun-soaked India, many adults are quietly struggling with vitamin D deficiency, a condition that could affect the brain decades later. A recent 16-year study tracking nearly 800 adults found that those with higher vitamin D levels in their 30s and 40s had lower levels of tau protein, a marker linked to dementia and Alzheimer’s disease. While this doesn’t prove vitamin D prevents cognitive decline, it suggests that maintaining healthy levels in mid-life may help slow brain ageing.
Despite abundant sunlight, deficiency is common. Factors like indoor lifestyles, air pollution, sunscreen use, and darker skin tones reduce the body’s ability to produce vitamin D naturally. Experts recommend regular, sensible sun exposure, about 15–30 minutes daily of direct sunlight on arms and legs, preferably during early morning or late afternoon hours when UV rays are moderate.
Dietary sources are also important. Foods rich in vitamin D include fatty fish like salmon and mackerel, egg yolks, fortified dairy products, and mushrooms exposed to sunlight. Including these in regular meals can help maintain levels, especially for people who spend most of the day indoors.
Supplements can be considered when sun exposure and diet aren’t enough, but they should be taken under medical supervision. Overconsumption, particularly of fat-soluble vitamins like A and D, can accumulate in the body and cause health problems, including vision issues, headaches, and organ damage. Periodic blood tests help ensure that supplementation is safe and effective.
Doctors and nutritionists stress balance. Maintaining adequate vitamin D through sunlight, diet, and professional guidance can protect long-term brain health and overall well-being, while avoiding the risks of blindly following high-dose supplements.
