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How the systems most likely to decide your lifespan actually break down: LDL and ApoB, blood pressure, the endothelium, coronary calcium, the dose-response math nobody teaches you.

What the tests can and cannot see. Why standard cardiac workups miss subclinical disease, what CCTA and calcium scoring actually measure, and how to advocate for the right scan.

The hallmarks of aging — mitochondrial dysfunction, inflammaging, intercellular signaling, the systems-level vocabulary for why human bodies break down with time.

DunedinPACE, GrimAge, PhenoAge — the closest thing we have to a real-time readout of biological aging. What they measure, what they don't, and the data on whether any intervention actually moves them.

Sauna, Zone 2, HIIT, sleep optimization, sunlight, fasting, and the specific named compounds and protocols. The Act 4 territory — calibrated reads on what's worth doing.

Where the popular health-science narrative breaks. Keto trials and their retractions, the LMHR hypothesis, supplement marketing, and the difference between mechanism and outcome data.

The system isn't designed for you. How to fight for the right test, the right diagnosis, and the right specialist when standard workups come back "normal" but you know something's off.