The paper I've spent most of my PhD working on is now published in The Lancet Digital Health. A selfie can be a biomarker. Our faces reflect many things about our health, from aging and lifestyle to disease. In our new study, we developed FAHR-Face, a foundation model trained on more than 40 million face photos. We used it to build two models that estimate biological age and mortality risk in cancer patients from a single selfie. One of the most interesting findings is that the two models capture different information. They focus on different facial features and provide complementary information about health. Doctors have always used appearance as part of their clinical judgment. With AI, we can start to measure some of these signals objectively. I believe face photos could become one of the most accessible biomarkers of health. But there is still a lot of work ahead before these models can be used in clinical care. Paper and our ongoing FaceAge research study in the first reply. Huge thanks to the team and my supervisors. cc @dbittermanmd @BenjaminKannMD @HugoAerts @Dr_RayMak