Deepinder Goyal’s health-tech startup Temple has announced what it describes as a major breakthrough in wearable technology with the discovery of a new biomarker called “Entropy”. The company claims the metric can measure the body’s real-time metabolic activity and provide a more accurate picture of energy expenditure than conventional heart-rate monitoring.
According to Temple, Entropy is a live score ranging from 1 to 250 that updates every second. The biomarker is designed to track the body’s “cost of being alive” by monitoring changes in metabolism triggered by everyday activities such as exercise, sleep, stress, meals, caffeine intake and meditation.
The startup says the biomarker can only be measured from the temple region of the head using its wearable device. Founder Deepinder Goyal revealed that Temple benchmarked Entropy against a laboratory-grade metabolic cart, widely regarded as a gold standard for measuring calorie expenditure. In internal testing involving more than 100 cardio sessions, Entropy reportedly showed a stronger correlation with metabolic readings than heart rate.
Temple has also introduced two related metrics, Entropy Maxima and Entropy Minima. While Maxima reflects peak physical output during exertion, Minima measures the body’s lowest resting metabolic state. The company believes these indicators could help users better understand fitness, recovery and long-term health.
The announcement has generated significant interest within the health-tech community. However, experts have also called for greater transparency around the underlying science, methodology and peer-reviewed validation supporting the claims.
As wearable technology increasingly shifts from activity tracking to predictive health monitoring, Temple’s Entropy could represent a new frontier in personal health analytics. Whether it becomes a widely accepted health metric will depend on future scientific validation and real-world adoption.
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