Taking us to the cutting edge of the new frontier of medicine, a visionary biotechnologist and a pathbreaking researcher show how we can optimize our health in ways that were previously unimaginable. They say we are on the cusp of a major transformation in health care—yet few people know it. At top hospitals and a few innovative health-tech startups, scientists are working closely with patients to dramatically extend their "healthspan"—the number of healthy years before disease sets in. 

Using information gleaned from our blood and genes and tapping into the data revolution made possible by AI, doctors can catch the onset of disease years before symptoms arise, revolutionizing prevention. Current applications have shown startling results: diabetes reversed, cancers eliminated, Alzheimer's avoided, autoimmune conditions kept at bay. This is not a future fantasy: it is already happening, but only for a few patients and at high cost. Proponents say it is time to make this gold standard of care more widely available.