Deepinder Goyal, Founder & CEO, Eternal (Zomato, Blinkit, District) has a habit of consistently making headlines. From offering a ₹20 lakh salary for a Chief of Staff role to turning delivery agent for a day, he regularly finds ways to stay in public conversations. But this time, it wasn’t a job posting or a bike ride that grabbed attention; it was a small object stuck to the temple area of his forehead during a school visit.
The visit was part of Feeding India, where Goyal shared photos from the event. In one of them, users spotted a golden, stone-like patch near his temple. That was enough. Within hours, the image spread across social media with jokes ranging from “Is this a sensor?” to “Infinity Stone unlocked.”
Two days later, he clarified in the comment section that the mysterious object was a prototype wearable device built to measure Brain Flow, a metric he considers essential for understanding ageing, cognition, and longevity.
According to Goyal, he has been wearing the device for nearly a year. It stems from his internal research on what he calls the Gravity Ageing Hypothesis, the idea that gravitational pull reduces cerebral blood flow over time, thereby accelerating ageing.
The device, now called “Temple”, is part of a new consumer-tech experiment he’s pursuing outside the food-tech world. The device is supposed to be placed near the temple area of the head so that it tracks cerebral blood flow in real time. The research work is being done under his biological science initiative, Continue Research.
Early experiments, he says, showed interesting results. In a small trial using inversion tables, where people spend time upside down, participants saw a 7% improvement in average brain flow over six weeks. Goyal claims this could potentially offset years of brain-flow decline linked with ageing. Temple isn’t ready for sale yet, but he believes such a wearable could become useful even if the gravity hypothesis doesn’t hold up fully.
But not everyone is convinced.
Dr Cyriac Abby Philips, widely known as The Liver Doc, called the idea of “gravity ageing” fake science.
Hello Deepinder, all the hypotheses discussed on your website have already been proven wrong through rational scientific approaches (see Table below).
— TheLiverDoc™ (@theliverdr) November 18, 2025
The "Gravitational Theory of Aging" is a reductionist, mono-causal hypothesis that is fundamentally irreconcilable with the… https://t.co/Z4VflJeVGY pic.twitter.com/O5fV0CIJy9
In a detailed post on X, he said the hypothesis ignores decades of established ageing research and called the device an early version of a “questionable longevity product” meant for 'gullible people.'
He's definitely sharing this as the CEO of Eternal because they are planning to build some sort of "device" that exploits vague areas in science and medicine or some cranky "longevity intervention" which they want to claim negates the effect of gravity indirectly and sell it to… https://t.co/5LSHGpbwJh
— TheLiverDoc™ (@theliverdr) November 16, 2025
Goyal responded firmly. “We didn’t make up the Gravity Ageing Hypothesis to sell Temple,” he wrote. “I wouldn’t risk my customers’ trust for a marketing trick.”
The criticism hasn’t slowed down the curiosity. If anything, it has amplified it. A device that isn’t even launched yet has already built hype thanks to one viral photo, a bold hypothesis, a public debate with a doctor, and a CEO who enjoys experimenting in public.
Whether Temple becomes a real consumer product or remains a niche research tool is still unclear. But one thing is certain: Goyal has again managed to turn an ordinary moment, a school visit, into a talking point.
