Our brain is the most intricate organ in the human body — orchestrating everything from memory and emotion to movement and sensory perception. While genetics play a role in brain ageing, our daily habits have an equally powerful influence on cognitive health and longevity. According to neurologist Dr. Sudhir Kumar, MD, DM, of Apollo Hospitals, Hyderabad, there are several common behaviours we engage in every day that may quietly damage our brain over time.

Let’s explore these seven habits, understand why they are harmful, and learn how simple lifestyle changes can protect your most valuable asset — your brain.

1. Insufficient Sleep (Less Than 6 Hours)

Sleep is not just rest — it’s a vital phase during which the brain consolidates memories, removes metabolic waste, and resets neural pathways. Dr. Sudhir highlights that sleeping less than six hours consistently can impair memory, slow reaction time, and even increase stroke risk.

Research shows that poor or irregular sleep disrupts the brain’s clearance systems and may contribute to cognitive decline and reduced mental alertness. Aim for 7–9 hours of quality sleep each night, creating a consistent sleep schedule and minimizing blue light exposure before bedtime.

2. Sitting for Long Hours

A sedentary lifestyle is harmful not just for your body — it also affects your brain. Dr. Sudhir warns that sitting for 8–10 hours a day can raise the risk of dementia and cardiovascular disease.

Studies also link extended sitting with brain volume loss and cognitive decline, independent of regular exercise, meaning a daily workout cannot fully offset hours spent inactive.

How to break the cycle:

• Stand up or walk for a few minutes every hour.

• Take active breaks during work.

• Incorporate light movement or stretching into daily routines.

3. Late-Night Screen Scrolling

Mindless scrolling might feel relaxing, but it affects both sleep quality and brain function. Constant screen use at night suppresses melatonin — the sleep hormone — leading to poor deep sleep.

Excessive screen time has also been associated with attention issues and reduced cognitive performance. By establishing screen-free time before bed, you allow your brain to slow down and prepare for restorative sleep.

4. Skipping Exercise

Regular physical activity is among the best things you can do for your brain. Exercise boosts levels of brain-derived neurotrophic factor (BDNF), a protein that supports neuron growth and plasticity — essential for learning and memory.

Conversely, a lack of regular exercise diminishes this protective factor, impairing cognitive resilience over time. Whether through walking, cycling, yoga, or strength training, 150 minutes of moderate-intensity exercise each week is a worthwhile target.

5. Uncontrolled Blood Pressure and Sugar Levels

Unmanaged hypertension or high blood sugar doesn’t just strain your heart — it silently damages brain blood vessels. This can lead to small vessel disease, increased stroke risk, and long-term cognitive deficits.

Keeping these parameters under control through diet, medication when prescribed, and regular monitoring is crucial. A balanced diet, regular physical activity, and stress management play vital roles in maintaining healthy blood pressure and glucose levels.

6. Chronic Stress

Stress in short bursts is normal, but prolonged stress floods the body with cortisol, a hormone that can shrink the hippocampus — the brain’s memory centre. Chronic stress can significantly affect brain structure and function.

Long-term stress is linked with mood disorders, poor concentration, and impaired learning capacity. Techniques like mindfulness, meditation, controlled breathing, and regular physical activity help regulate stress and protect the brain.

7. Ignoring Snoring — Possible Sleep Apnoea

Though many dismiss snoring as a minor inconvenience, it can be a sign of sleep apnoea — a condition where breathing repeatedly stops during sleep.

Sleep apnoea disrupts oxygen flow to the brain, leading to daytime brain fog, poor memory, and heightened stroke risk. If snoring is loud, frequent, or accompanied by daytime fatigue, it is important to seek medical evaluation.

Conclusion: Your Brain Needs Daily Care

As Dr. Sudhir emphasizes, the brain often ages faster from lifestyle choices than from chronological age. The good news is that most of these risk factors are modifiable. By prioritizing sleep, movement, stress management, and mindful health habits, you can significantly improve your brain health and reduce the risk of cognitive decline.

Adopting brain-friendly routines is not about perfection — it is about consistent, intentional choices that support a sharper, healthier mind over the long term. Your brain deserves the best care — start with small changes today.