Most people feel an enormous sense of relief when they pick up their lab results and see every value sitting comfortably in the “green zone.” The doctor glances at the report, tells you everything looks fine, and sends you off until next year.
But in longevity science, there's a dirty little secret: being “within normal range” today essentially means being sick.
Why? Because laboratory reference ranges don't show what's optimal for the human body. They simply reflect the average state of the population. And today, the population is sicker than ever.
Here are three scientific facts that prove why the traditional reading of lab results keeps you far from true health.
1. “Average” Today Means “Metabolically Damaged”
The authors of “Trends and Disparities in Cardiometabolic Health Among U.S. Adults, 1999–2018” (O'Hearn et al., 2022) examined changes in optimal cardiometabolic health in the U.S. population over a span of nearly 20 years. Optimal health in this study is defined by the combination of five factors: healthy weight (absence of obesity), normal blood glucose, normal blood lipids (cholesterol), normal blood pressure, and the absence of clinically established cardiovascular disease.
The key findings:
- In 2017–2018, only 6.8% of U.S. adults had optimal cardiometabolic health — a significant decline compared to 1999–2000.
- The proportion of people with optimal body weight dropped from 33.8% to 24.0%.
- The proportion with healthy blood glucose fell sharply from 59.4% to 36.9%.
- The only component showing improvement was blood lipids, where optimal levels rose from 29.9% to 37.0%.
This is an alarmingly small percentage of healthy adults. When you walk into a lab and your results land “in the middle of the normal range,” you are de facto comparing yourself to a society in which over 93% of people are metabolically impaired.
At FixMyAge, we don't want you to be merely “average” — because today's statistics work against you.
2. Today's “Normal” Testosterone Would Have Been Critically Low for Your Grandfather
It's well known that testosterone levels in men decline with age. However, scientists have noticed that the individual drop in testosterone over time is steeper than the differences seen between age groups at any single point in time.
The study “A Population-Level Decline in Serum Testosterone Levels in American Men” (Travison et al., 2006) concludes that in recent decades there has been a serious, age-independent decline in testosterone levels among American men. Since classical risk factors (such as obesity and chronic disease) do not fully explain this phenomenon, the authors hypothesize it may be driven by environmental factors (e.g., exposure to endocrine-disrupting chemicals) or other health and behavioral changes not directly measured in the study.
Laboratories continuously adjust their reference ranges downward to reflect this general deterioration. When your doctor tells you your testosterone is “within normal range,” they mean the norm for 2026. But the same levels would have been considered critically low by your grandfather's standards.
3. The Risk Hides Inside the Green Zone
Traditional medicine typically waits for a marker to flash red before reacting. But cellular damage begins much earlier — while your results still look “perfect” on paper.
A classic example is glycated hemoglobin (HbA1c) — a key marker of blood glucose control. The large European EPIC-Norfolk study (Khaw et al., 2004) showed that the risk of cardiovascular disease and mortality begins to rise long before a person is diagnosed with diabetes.
The risk lives inside the green zone. If you wait for your results to fall outside the normal range, you're already too late.
The Takeaway
True biohacking and longevity science aren't interested in the absence of diagnosis. They're interested in the peak performance of the body.
Don't be normal. Be optimal.
References
- Travison, T. G., Araujo, A. B., O'Donnell, A. B., Kupelian, V., & McKinlay, J. B. (2006). A Population-Level Decline in Serum Testosterone Levels in American Men. The Journal of Clinical Endocrinology & Metabolism, 92(1), 196–202. https://doi.org/10.1210/jc.2006-1375
- O'Hearn, M., Lauren, B. N., Wong, J. B., Kim, D. D., & Mozaffarian, D. (2022). Trends and Disparities in Cardiometabolic Health among U.S. Adults, 1999–2018. Journal of the American College of Cardiology, 80(2), 138–151. https://doi.org/10.1016/j.jacc.2022.04.046
- Khaw, K., Wareham, N., Bingham, S., Luben, R., Welch, A., & Day, N. (2004). Association of Hemoglobin A1c with Cardiovascular Disease and Mortality in Adults: The European Prospective Investigation into Cancer in Norfolk. Annals of Internal Medicine, 141(6), 413–420. https://doi.org/10.7326/0003-4819-141-6-200409210-00006