Ideas & evidence

A repeatable result, a useful risk signal and a proven treatment target are three different achievements.

Fitness predicts outcomes in cohorts. That does not turn a watch estimate into a personalized survival forecast.

A stronger squeeze predicts better outcomes in populations, but the practical goal is preserving what you can do.

A glucose graph can reveal patterns. It cannot by itself establish that you need treatment or that a flatter line improves longevity.

A scan estimates tissue compartments. Preparation and repeatability determine whether a small change is believable.

A wearable can help describe your routine while leaving important sleep problems unresolved.

The training target explains why two credible clocks can give you different answers.

The useful unit is a well-supported decision, not the number of biomarkers in a membership.