You will notice this is landing a day later than usual. Friday got away from us. Which is the right accident, because this is the sort of piece that sits better with a weekend coffee than a rushed read on Friday.
Wednesday we walked through the three hormones worth testing at 40+. Cortisol pattern, thyroid full panel, and testosterone for both sexes. In reply we heard the same thing from readers all week. Can’t see my doctor for two weeks. The results will not be back for weeks after that. Or Function Health at $365 a year feels like a lot to commit to.
Which is the whole point of this piece. Knowledge is the lever nobody markets. The panel tells you where you are. The reading tells you what to do. Both are cheaper than not knowing.
The intervention side of the equation is largely universal. The same handful of lifestyle levers move most of the markers on any comprehensive panel a reader might ever run. Which is why the researchers we cover in these newsletters keep prescribing the same handful.
Sleep, resistance training, an aerobic base, protein, wholefoods focus, weight in a healthy range. Cover those six and you have moved the majority of what a full panel would measure.
The levers that move multiple markers at once
Sleep 7 to 9 hours consistently. Rachel Leproult and Eve Van Cauter at the University of Chicago, JAMA 2011, had 10 healthy young men sleep less than 5 hours a night for one week. Their testosterone fell 10 to 15 percent, equivalent to aging them 10 to 15 years. The same group's 1999 Lancet study put 11 young men on 4 hours a night for 6 nights and measured 30 to 40 percent reductions in glucose tolerance and insulin response. Sleep alone moves testosterone, cortisol pattern, insulin sensitivity, HbA1c, inflammation markers, and hunger hormones.
Heavy resistance training 2 to 3 times a week. The LIFTMOR trial and the surrounding literature we covered in last Friday's bone-density piece show heavy compound lifting builds bone density at the spine, hip, and femoral neck, raises testosterone in both sexes, improves insulin sensitivity, lowers blood pressure, and lifts the strength-based mortality markers we covered earlier in the year.
An aerobic base of 2 to 3 hours a week. Zone 2 and interval work together lower ApoB, raise HDL, improve VO2 max, and raise mitochondrial density. The Monday mitochondria piece covered the cellular version of this. The VO2 max piece from June covered the whole-body version.
Protein 1.2 to 1.6 g/kg per day. Moves satiety hormones (GLP-1, PYY, cholecystokinin), preserves lean mass through midlife, supports testosterone indirectly by supporting muscle mass, and raises the thermic effect of every meal.
A wholefoods focus. The plant-forward, minimally-processed pattern from Wed Aug 5 moves ApoB, LDL, triglycerides, fasting glucose, HbA1c, blood pressure, CRP, and the gut microbiome markers most comprehensive panels now include. PREDIMED, the reference RCT, cut major cardiovascular events 31 percent versus a low-fat control. At the grocery store the useful distinction is not vegan versus carnivore. It is whole versus ultra-processed.
Weight in a healthy range. A modest 5 to 10 percent weight loss in overweight adults moves fasting insulin, HbA1c, triglycerides, ApoB, blood pressure, and inflammatory markers simultaneously. This is the single most upstream intervention on a comprehensive panel, which is exactly why the GLP-1 piece two weeks ago mattered for a specific population.
Where reading meets doing
Nobody sells you the reading. Nobody markets knowledge as a longevity lever. Which is why testing can feel expensive at $365 a year, and why reading a longevity newsletter can feel like a nice-to-have rather than an actual health investment.
The math is the other way around. A year of Function Health is $365. A year of not knowing your ApoB, your fasting insulin, your testosterone total and free, and your thyroid pattern in your 40s or 50s can cost you years off your healthspan, and the medical bills that stack up when something preventable becomes something urgent.
Ignorance is not the cheap option in longevity. It is by far the most expensive one.
The same math is true for the knowledge. Free. 5 minutes, 3 times a week. And the six levers above are the ones the researchers who actually study this keep coming back to, regardless of which specific marker on your panel is out of range.
Book the bloodtest.
None of these are sponsored. What they do is foundational to a real healthspan practice, so they earned the inclusion.
US: Function Health. $365 a year, 160 biomarkers across two Quest draws, licensed physician review of results. Or take your own route with Ulta Lab Tests, which lets you order individual panels a la carte across 2,000+ US draw sites.
Everywhere else: Google "DTC hormone blood test panel". Medichecks in the UK, iScreen in Australia, similar direct-to-consumer providers in most markets.
Longevity Daily / The Building Decades