On the occasion of World Brain Day, health experts are highlighting the importance of protecting brain health from early adulthood rather than waiting until old age. While many people associate brain-related concerns with memory loss and conditions such as dementia after the age of 60, doctors say the foundation for long-term cognitive health is built much earlier. Lifestyle choices made during the 20s and 30s can significantly influence how well the brain functions in later years.

The brain is one of the body's most active organs, responsible for memory, movement, decision-making, emotions, and learning. Experts explain that brain ageing does not suddenly begin in old age, as important changes related to cognitive processing, neural connections, and adaptability begin much earlier. Dr Rajinder Kumar, Principal Director and Unit Head of Neurosurgery at Yashoda Institute of Neurosciences, said factors such as poor sleep, chronic stress, lack of physical activity, unhealthy metabolic conditions, and social isolation can gradually affect the brain's cognitive reserve, which helps it withstand ageing and disease.

Doctors also emphasise that conditions such as dementia often develop silently years before symptoms become visible. Dr Atampreet Singh, Senior Director and Head at ShardaCare - HealthCity, referred to the Lancet Commission's 2024 report on dementia prevention, which suggested that a significant proportion of dementia cases could potentially be delayed or prevented by addressing modifiable risk factors. These include high blood pressure, obesity, diabetes, hearing loss, depression, physical inactivity, and excessive alcohol consumption, highlighting the strong connection between lifestyle and brain health.

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Experts now view brain health as a lifelong practice rather than a concern limited to older adults. Increasingly, preventive healthcare approaches are focusing on early cognitive assessments, workplace wellness programmes, and habits that support long-term mental performance. One of the brain's most important abilities is neuroplasticity, which allows it to create new connections, learn skills, and adapt throughout life. However, prolonged stress, poor sleep, excessive screen use, unhealthy diets, and inactivity can reduce this ability over time.

Doctors also point to the role of inflammation and blood vessel health in maintaining brain function. Long-term low-grade inflammation, often linked to obesity, insulin resistance, smoking, air pollution, and chronic stress, may affect communication between brain cells. Similarly, conditions such as uncontrolled blood pressure, high cholesterol, and diabetes can damage the small blood vessels that supply oxygen and nutrients to the brain. Health experts say protecting cardiovascular health is closely connected with protecting cognitive health.

Maintaining brain health does not require complex treatments but depends on consistent daily habits. Regular exercise, quality sleep, stress management, continuous learning, social connections, a balanced diet, and controlling blood pressure, cholesterol, and blood sugar levels can all support a healthier brain. Experts compare building cognitive reserve in early adulthood to saving for retirement, where small investments over time provide long-term benefits. On World Brain Day, doctors stress that caring for the brain should begin decades before problems appear, helping people maintain sharper thinking and a better quality of life as they age.

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