Hundred Health and BellSant Become One to Make Precision Health Personal, Proactive, and Always On

Before Tyler Smith founded Hundred Health, he was leading SkySlope, a real estate software firm he built and later sold a majority stake in to Fidelity. Despite his success, Smith found himself confronting a more personal question: how well was he aging? “I was turning 39, and my wife and I were having our first child a little bit later in life,” Smith said in an interview. “I began thinking about life a little differently, like, how old is my child when they’re driving? And how old is my daughter going to be when she’s graduating?” Prompted by that reflection, Smith took a biological age test. Though he exercised regularly and maintained a healthy diet, the results were unexpected—his biological age came back at 47. “I had more data on my businesses—arguably even on my car—than I did on my own body,” he said. “That was kind of like a big wake-up call.” Smith responded by hiring a team of longevity specialists and undergoing a full suite of diagnostics from blood biomarkers and wearables to genetic testing and full-body MRIs. A year later, he had reduced his biological age to the early 30s. That experience eventually led him to build Hundred Health, a platform designed to make high-fidelity health tracking and individualized insights available to a broader population for under $1.50 a day. Now, with its acquisition of longevity platform BellSant, Hundred Health is expanding its capabilities with a substantial injection of scientific depth. In an exclusive interview with AIM Research, Tyler Smith talks to us about why this collaboration was necessary. The all-stock deal gives Hundred access to BellSant’s proprietary datasets, spanning aging, genomics, metabolic biology, sleep science, and cognitive health developed by more than 25 researchers from Johns Hopkins, Harvard, Columbia, and Stanford. “Matt and the BellSant team have assembled one of the world’s richest longevity datasets,” said Smith. “By folding their science directly into our platform, every member will have on-demand access to the collective expertise of dozens of leading researchers to inform smarter, personalized health decisions.” The integration will strengthen several core features of the Hundred platform, including peer-based comparisons, dynamic reference ranges, and longitudinal health tracking. BellSant’s models include optimal biomarker ranges, hazard-ratio functions, and demographic personalization logic, allowing Hundred to deliver more context-aware insights. “We’ll begin by ingesting BellSant’s optimal biomarker ranges and hazard‐ratio functions into our existing data, ensuring seamless alignment,” Smith said. “Layered on top of this, BellSant’s demographic personalization logic—accounting for factors like age, sex, genetics, and lifestyle—will enable us to generate truly individualized reference ranges, so that recommendations are contextually tailored. For example, a 45‑year‑old endurance athlete receives different thresholds than a 65‑year‑old office worker.” Smith noted that the platform’s AI engine takes raw health inputs and transforms them into narrative insights that guide users step by step. “Our AI engine takes the raw data across blood, genetic, and wearable data and distills it into clear insights that guide users step by step,” he said. “Behind the scenes, natural‑language synthesis algorithms parse BellSant’s hazard‑ratio models and our longitudinal trends to identify what’s working—for example, ‘Your inflammatory markers have improved 15% since last panel, likely due to your Mediterranean‑style diet’ and where to focus next, like, ‘Let’s boost your HDL by adding a 10‑minute brisk walk each morning.’” Each recommendation is presented in an action-oriented narrative structure—“Here’s your win,” “Here’s your next priority,” and “Here’s exactly how to do it.” Users who want additional context can access plain-language explainers or links to primary research. Matt Fellowes , who founded BellSant, will join Hundred’s advisory board. Select members of his team will also transition to Hundred to help integrate the two systems and accelerate the product roadmap. “Choosing a future for BellSant’s platform wasn’t a decision we made lightly,” said Fellowes. “After careful evaluation, it was clear that Hundred represented not just the right home but the right future. Tyler and his team aren’t just building technology—they’re building a fundamentally better model of healthcare. One that is intelligent, personal, and empowering. I couldn’t imagine a better partner to carry this mission forward.” One of the near-term outcomes of the acquisition is the ability to generate earlier warnings and more precise recommendations based on biomarker trends. “We’ll be able to surface early‑warning alerts when users’ longitudinal biomarker trends cross risk thresholds, months or even years before conventional diagnostics would catch them,” Smith said. Hundred plans to expand into AI-guided coaching, drawing on BellSant’s models to simulate the

Hundred Health and BellSant Become One to Make Precision Health Personal, Proactive, and Always On

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