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The Hindu

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Does the Temple wearable reveal useful information about brain health?

Billionaire Deepinder Goyal has begun selling Temple, a temple-attached wearable he says can monitor brain health and ageing by measuring cerebral blood flow outside the lab. Critics and doctors question the devices medical claims, noting the evidence is preliminary, not peer-reviewed, and its core metricthe Brain Flow indexremains controversial amid concerns over links to longevity or cognitive outcomes

10 Nov 2026 2:54 pm