Pixel Watch 5 tracks insulin resistance — a wearable first

Google's health-AI push reached the wrist on Wednesday: the Pixel Watch 5 and Fitbit Air pick up a first-of-its-kind insulin-resistance tracker, built on a sensor foundation model trained on a trillion minutes of real-world data. Meanwhile, the Zed team opened the beta for Delta, a multiplayer environment for coding with agents.

Google's Pixel Watch 5 introduces insulin-resistance trend tracking — a wearable first that reads metabolic health from multi-week physiological data without a single drop of blood. The feature is part of Health Guardian, a new suite for Pixel Watch and Fitbit Air that also estimates blood-pressure trends without a cuff, scores sleep breathing quality, and can auto-call emergency services if blood oxygen collapses during a breathing emergency (the latter on Pixel Watch in select European countries). Google says the insulin-resistance model is built on SensorFM, a large sensor foundation model pre-trained on over a trillion minutes of data from five million opted-in users, with accuracy validated against standard clinical blood tests in a study published in Nature. Roughly 40% of adults don't realize their insulin resistance is climbing, per the research Google cites — the pitch is catching quiet metabolic drift early enough to act on it.

This is the most ambitious consumer-health claim a smartwatch maker has made yet, and Bloomberg notes the category first. The caveats are real: the trends roll up into a monthly summary in the Google Health app, Health Coach — the Gemini-powered interpreter for all this data — requires a paid Google Health Premium subscription, and Google is careful to label everything as wellness information, not a diabetes prescreener. Still, this is the clearest sign yet that the trillion-minute sensor models Google has been quietly building are becoming actual products, and offline Gemini support on the Watch 5 keeps the on-wrist AI story moving. It also lands the same week Google's Pixel 11 makes Gemini the centerpiece of the AI phone war — health is now firmly part of that pitch.

Zed launched the private beta of Delta, a multiplayer environment for coding with agents — the first real application built on its DeltaDB foundation. Delta keeps code and the conversation that produced it connected in real time: every edit and exchange is captured between commits, comments anchor to the code as it evolves rather than to stale snapshots, and the agent stays in the thread, so reviewers ask it to explain or fix rather than reconstruct intent from a diff. Threads sync to the cloud, teammates can open any thread in a browser without installing anything, and it plugs into third-party agent harnesses starting with Claude Code. For teams drowning in agent-generated diffs, that's the missing review layer — and it's the second half of Zed's long-held plan to make the editor "the best place to talk about code."

What to watch: whether Health Guardian's September rollout (and Premium paywall) draws regulatory attention, and how many teams adopt Delta before its general release.

Would you trust a watch to track your insulin resistance — or is this where wearables overreach? Tell us in the comments.

Sources: Google Blog · Bloomberg · Engadget · BGR · Zed Blog