Victoria Song's 100-day digital twin: score up nine, no weight lost

Twin Health's program sits at the lowest-stakes, highest-reward end of digital twin technology. A metabolic twin — built from 90 days of Dexcom G7 CGMs, a smart scale, a blood pressure cuff, multivitamins, an Apple Watch, and a Quest Diagnostics blood draw — is experimental, and the company's own coach told the reviewer that tracking fatigue is frequent user feedback.

Her results were mixed. The lab improvement came against a backdrop of numbers that were already slowly improving before she started, though they fell faster during the trial. That nuance matters as researchers explore digital twins for cancer care, where the trust burden for data privacy is far higher, and the continuous stream of sensitive information a twin needs raises unanswered questions about what happens to that data after treatment ends.