@Google is walking the increasingly thin line between wellness and medicine. Pixel Watch can now give users trends in blood pressure and insulin resistance without a cuff or blood draw. It infers them from longitudinal sensor data rather than directly measuring either in the conventional clinical sense. The interesting part is what happens next. Google is explicit that these are wellness insights, not clinical readings, diagnostic screening or something you should use to change medication. But if your watch tells you your blood pressure or insulin resistance trend is worsening, the obvious next step may be to confirm it clinically and potentially start a conversation about diagnosis or treatment. That makes the boundary fascinating: wellness information that can trigger a medical pathway without itself being a medical diagnosis. Wearables are getting increasingly close to the medical-device boundary while becoming increasingly explicit about saying they have not crossed it. And the FDA's latest guidance helps make that 'fine line walking' possible. It explicitly allows some non-invasive wearables to estimate physiological parameters such as blood pressure while remaining in the general-wellness category, provided they stop short of screening, diagnosis, disease management or directing treatment