Discuss the potential and limitations of continuous physiological monitoring for early detection of dementia in an ageing India.

Dementia is the progressive loss of memory and reasoning. It affects about 55 million people worldwide and has no cure [1]. Wearables that track sleep, heart rhythm or brain blood flow, such as the head-worn Temple device, promise early warning for an ageing India. That promise holds only if their readings are proven accurate.

Potential

• Early risk flagging: WHO stresses risk reduction and early support [1]. A person's readings tracked over months could prompt a doctor's visit years before symptoms appear.
• Vascular window: Hypertension and diabetes are dementia risk factors [1]. Continuous blood-pressure and blood-flow data could help people manage them early.
• Closing the diagnostic gap: MRI, PET and SPECT are costly, available only in clinics, and give a single snapshot. A cheap device worn daily can reach small-town and rural elderly people.
• Lighter caregiver load: Women provide about 70% of dementia care hours [1]. Earlier warning allows families to plan care.
• Digital health integration: Wearable data could feed Ayushman Bharat Digital Mission health records and population studies.

Limitations

• Unproven validity: No published study has compared Temple's readings with ASL-MRI or transcranial Doppler, the trusted hospital tests. The brain's cerebral autoregulation also keeps blood flow fairly steady, so a single reading says little. A link between blood flow and dementia does not make the device a diagnosis.
• Clinical harms: False alarms lead to costly scans and anxiety. False reassurance delays care, which is the worse outcome.
• Regulatory grey zone: Devices are regulated as "drugs" under the Drugs and Cosmetics Act, 1940, and only devices notified by name are covered [2]. A product sold for "wellness" can avoid CDSCO approval altogether.
• Neural-data privacy: UNESCO's 2025 Recommendation on the Ethics of Neurotechnology treats neural data as uniquely sensitive and calls for strict safeguards [3]. Brain data collected round the clock carries that risk.
• Equity: Premium devices and low digital literacy among the elderly can widen the health-tech gap.

Continuous monitoring can fill a real screening gap, but without proven accuracy, regulation and privacy safeguards it should remain a research tool. The way forward has four parts. Parliament should pass a separate medical-devices law with a National Commission on Medical Devices, as the 138th Standing Committee Report recommended [2]. Makers should publish peer-reviewed validation data. Data rules should follow the UNESCO Recommendation [3]. Monitoring should be linked to NPHCE geriatric services. Together these would advance SDG 3 and the right to health under Article 21.