Engineer Mark Talbot was tracking his weight, food, steps, and sleep across five apps when his weight loss stalled, and none of them could tell him why. One question to AI about a year of his own Apple Health data gave him the answer. It also pointed to a bigger gap: doctors never see what happens between visits.

Dr. Jeremy Koenig talks with Mark Talbot, co-founder of Lifecycle Health, a platform that brings patients' wearable data into specialist practices. After going from about 5,000 to 12,000 daily steps and losing five to seven pounds in under a month, Talbot shared the idea on LinkedIn and heard from more than 80 people in under 10 days, including cardiologists, menopause specialists, and weight loss clinics. He explains how a practice can go live in about 10 minutes, how each patient is flagged red, amber, or green against their own baseline, and how cardiologists can watch blood pressure readings come in after a heart attack instead of waiting for the next appointment. They also discuss an early pattern from a small informal group of women wearing Oura or WHOOP, where skin temperature rose a few minutes before a hot flash, and ask whether longitudinal health data could replace "How have you been?" at every GP visit.

Mark Talbot is co-founder of Lifecycle Health and a former mainframe systems programmer whose career runs through British Airways, IBM, and two decades building software partnerships.

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