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Low vitamin D is genuinely common and associated with worse health — yet large trials show that supplementing people who are already replete does little. The nuance is the whole point.
Blood lipids are not just a correlate of heart disease — the ApoB-carrying particles causally build arterial plaque over a lifetime. Here is what LDL, HDL, triglycerides and ApoB actually mean.
Acute inflammation heals you; chronic, low-grade inflammation slowly wears you down. It rises with age — 'inflammaging' — and a simple blood marker, hs-CRP, offers a window onto it.
Blood pressure is one of the few longevity markers you can check in two minutes — and one of the most consequential. It usually causes no symptoms while it quietly ages your arteries.
Muscle is not just for movement — it is a metabolic reserve the body draws on in illness and age. From about your thirties it slowly shrinks, and how much you keep tracks with long-term health.
How fast you walk at your natural, comfortable pace turns out to be one of the strongest simple predictors of healthy aging — measurable with nothing but a tape measure and a stopwatch.
Two of the easiest numbers to measure — how fast your heart beats at rest, and how much the interval between beats varies — quietly track cardiovascular health and aging.
One of the cheapest measurements in medicine — how hard you can squeeze — turns out to be a strikingly good predictor of long-term health. Here is why, and what moves it.
Of all the numbers you can track, few predict long-term health as strongly as VO2max. Here is what it measures, why fitness maps so tightly to lifespan, and how the number moves.
Two people born on the same day can be biologically years apart. Here is what biological age means, how researchers estimate it, and why it responds to how you live.
Articles in this section are educational and are not medical advice, a diagnosis, or a prescription. Consult a qualified professional before acting on anything you read here.