xpert explains how chronic sleep deprivation can physically shrink human brain volume

Brain health is central to every human function, yet everyday habits can quietly accelerate cognitive decline. Dr Kunal Sood, an anaesthesiologist and interventional pain medicine physician, shared five critical facts via Instagram on Tuesday.

He explained that sleep deprivation is directly linked to a reduction in grey matter volume. Dr Kunal Sood said, “Sleep deprivation is associated with reduced grey matter volume and hippocampal atrophy, key areas for memory and learning.” Chronic poor sleep impairs the clearance of metabolic waste, effectively accelerating the ageing process of the brain.

Chronic stress impairs memory and focus

Persistent stress keeps cortisol levels elevated, which disrupts the formation of new neurons. This hormonal imbalance directly affects the hippocampus and prefrontal cortex. According to Dr Sood, this leads to the following:

• Impaired attention and working memory.
• Disrupted synaptic signalling.
• Increased neuroinflammation and oxidative damage.
• High blood sugar and hearing loss

The physician also highlighted that chronic hyperglycemia is linked to smaller brain volumes and microvascular injury. This damage to small cerebral vessels impairs blood flow and neuronal function.

Furthermore, longitudinal studies suggest a strong link between hearing loss and dementia. Dr Sood emphasised, “Proposed mechanisms include increased cognitive load, reduced auditory stimulation leading to structural brain changes, and social isolation.”

To counteract these risks, Dr Sood suggested that omega-3s and creatine can support brain energy metabolism and neuronal integrity.

Omega-3s help reduce neuroinflammation, while creatine maintains performance under fatigue. Prioritising these nutritional supports alongside better sleep and stress management is essential for long-term cognitive health.

"Please Note: This information is for educational purposes only and does not count as medical advice. Readers should always consult a qualified doctor regarding any questions about their health or a medical condition."