You don't feel a slow decline. That is what makes it slow.
Nothing about the years between forty and sixty announces itself. Markers drift a little each year, stay inside their ranges the whole time, and one day you notice you do not recover from anything the way you used to.
Longevity work is not exotic. It is noticing the drift early, while it is still cheap to correct.
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There is an entire industry built on selling you more numbers. More numbers are not the same as more insight. What matters is which of yours have shifted since last time, in what direction, and whether that direction is worth doing something about now rather than in ten years. That takes a clinician reading a trend, not an app printing a dashboard.
I am not especially interested in helping you live to a hundred if the last twenty years are spent managing conditions. I am interested in you being able to carry your own groceries, sleep through the night, and think clearly at seventy-five.
That is built in your forties and fifties, out of unglamorous things: protein, strength, sleep, blood sugar, and catching drift early. No exotic protocol required.
Advanced Strategies for Lifespan Optimization
FMACP
Functional Medicine Academy Certified Practitioner