Gut Brain Axis: What the 90 Percent Serotonin Fact Actually Means
Ninety percent of your serotonin is made in your gut. That is true, and it is doing a job it was never fit for, because the finished molecule cannot reach your brain.
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Waist Size vs Weight: Why a Normal BMI Can Hide the Bigger Risk
Two men, same height, same weight, identical BMI. One carries it across his frame and the other carries it around the middle. In the mortality data they are not the same man.
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Adrenal Fatigue vs Burnout: Neither Word Means What You Think
One term has a name and no illness behind it. The other is real, recognized, and still not classified as a medical condition. What a systematic review and the WHO actually concluded.
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Health Screenings by Age: What the Guidelines Actually Recommend for Men
Screening recommendations carry letter grades, and the grade tells you more than the age band does. Why the PSA test is a C, why colorectal screening moved to 45, and how to read the code before you accept a test.
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Processed Food and Hormones: The Stop Signal That Arrives Too Late
Two diets matched for calories, sugar, fat and fiber. People ate 508 calories a day more on the processed one without noticing. The appetite hormones were working fine, they were just too slow.
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Increase Testosterone Without TRT: What Actually Moves the Number
Applied strictly, the clinical definition of low testosterone captures about two percent of men aged 40 to 79. What the research says actually moves the number, and why there is no supplement list here.
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Heart Rate Variability: Why Your Number Means Less Than You Think
Your ring reports a number every morning. Age, sex, weight and training habits together explain about fifteen percent of why it is what it is. What the biggest free-living dataset found, and the only comparison worth making.
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ApoB vs LDL Cholesterol: What Your Panel Actually Measures
A standard lipid panel measures how much cholesterol is being carried. It does not count the particles carrying it, and the particles are what damage arteries. Here is the evidence, and a better number you can calculate for free right now.
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What a Sauna Actually Does to Your Heart: The Evidence
The famous sauna statistic, a 63 percent lower risk of sudden cardiac death, came from 201 men. Here is what the Finnish research actually found, what happened when a much larger study asked the same question, and what a reasonable person should do about it.
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What Sitting All Day Does (And What Cancels It Out)
A Lancet meta-analysis of more than a million adults found the exact dose of daily activity that eliminates the mortality risk of sitting for eight hours. It is higher than most desk workers assume, and one form of sitting refuses to be cancelled.
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Grip Strength: The Longevity Marker Your Doctor Skips
Grip strength predicts mortality better than systolic blood pressure, costs almost nothing to measure, and almost no routine physical includes it. Here is what the research actually found, and why training your grip is not the answer.
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Zone 2 Cardio Explained: Why Slow Training Builds Better Endurance
Why the slowest, most boring workout builds the biggest engine and where the hype goes too far Zone 2 cardio is having a moment. Peter Attia has been one of its most vocal advocates. Huberman put it on the map for millions. Every fitness influencer now preaches the gospel of the slow jog. And a…
