You're not short on longevity advice. You're short on knowing what to fix first.
Fast. Lift. Sleep. Cut sugar. Supplement. Track your glucose, your VO₂ max, your HRV. You've heard it all — maybe you've even read the big books. So why does staying healthy still feel like guesswork?
Here's the uncomfortable truth: your healthspan isn't set by your strongest habit. It's capped by your weakest one. Biologists call it the Law of the Minimum — a barrel holds only as much water as its shortest stave. You can perfect fifteen factors of a long, healthy life, but if one is quietly failing, it drags the whole system down with it. Doing more won't fix that. Finding the right thing will.
That's what this book is for.
In Human Health Decoded, Dr. phil. nat. DIRK FEIDEN distills five years of research into the 16 factors that decide how long — and how well — you actually live. Together they form the Feiden Health Formula: not another endless to-do list, but a prioritized system that shows you where you stand on each factor and, crucially, which one to address first.
Most longevity books hand you everything at once and leave the sequencing to you. This one is built around the sequence. You assess yourself across all 16 factors, you find the link that's holding the rest back, and you start there — where your effort returns the most healthy years. Then you move to the next. Simple, repeatable, and grounded in science rather than the latest trend.
Inside, you'll discover
- →The 16 factors that quietly determine your healthspanAnd why they work as one connected system, not sixteen separate chores.
- →Why "doing more" can actually be capping your resultsAnd how to spot the single weakest link holding everything back.
- →The Feiden Health FormulaA clear way to score yourself and turn vague good intentions into a sequence you can act on this week.
- →How to stop spreading your energy thinAnd start with the one change that moves the needle most.
- →A framework that's rigorous but livableNo extremes, no guilt, no overwhelm.
This book is for you…
- ✓if you're health-conscious but worn out by contradictory advice,
- ✓if you've read Outlive, Lifespan, or How Not to Die and still don't know where you personally should begin,
- ✓or if a milestone birthday — or a health scare close to home — just turned "someday" into "now."
The goal was never simply to live 100 years. It's to live 100 good ones: strong, clear, and present for the life you've built.
Find your weakest link. Fix that first.
Your hundred healthy years start on a single page.
