Deepinder Goyal's Temple Claims Discovery of a Biomarker 'Entropy'
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Temple has positioned the metric as a new way to understand metabolism and physical performance, describing it as a measure of the "cost of being alive."
Deepinder Goyal-led health wearable startup Temple has claimed to have discovered a new biomarker called "Entropy," which it says can measure the body's real-time energy expenditure using signals detected only from the temple region.
Temple has positioned the metric as a new way to understand metabolism and physical performance, describing it as a measure of the "cost of being alive".
Temple has been building a wearable that measures physiological signals from the temple region rather than conventional locations such as the wrist or finger.
Last month, Goyal said the startup had received more than one lakh applications for early access, with only 100 users selected for initial testing. Temple has not yet announced a commercial launch date or pricing for the device.
According to Temple, Entropy appears as a live score on the wearable's home screen, updating every second on a scale of 1 to 250, reflecting how much energy the body is using at any given moment, with lower values indicating deeper states of rest and higher values corresponding to intense physical exertion.
Goyal said the lowest score recorded so far has been observed only briefly in experienced meditators, while the highest scores have been seen in elite athletes performing at peak intensity.
Temple says the metric responds to a wide range of physiological changes, including sleep, stress, exercise, caffeine intake, meals, meditation and cold exposure.
The startup also claims that Entropy outperforms heart rate as a measure of metabolic activity.
In his X post, Goyal said Temple benchmarked Entropy against a metabolic cart, or calorimeter, across more than 100 cardio sessions. He claimed Entropy achieved a correlation coefficient of r=0.93 (p<0.001) with calorimeter readings, compared with r=0.55 for heart rate.
However, Temple has not yet published any peer-reviewed evidence validating Entropy as a biomarker.
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