From the Author
As I matured in the world of health, fitness, and anti-aging, I learned all the standard ways of looking at the problem — hormones, molecular pathways, protein names, and of course, the "miracle cure of the day." Over time, I grew disillusioned. Miracle cures always fail, and those promoting them simply move on to the next one. The same studies on sleep, exercise, nutrition, and disease are repeated endlessly by health enthusiasts across the internet — yet rarely does any real progress emerge.

These conversations tend to follow trends, not principles. They lack underlying logic. People educated in this environment are conditioned to chase quick fixes, dabble in them (or not), and move on to the next hype. But that's not science — it's nonsense.
We need a different approach.
This alternative path may be slower. It demands more intellectual effort. But it's the only path that leads to anything real. My goal in this book is to build a fundamental understanding of the key principles that, in my view, truly govern health and aging. These principles are like natural laws — consistent, observable, and non-negotiable — and must be identified if we want to make real progress.

This book won't be for everyone. But I believe it will resonate with the intellectually mature, those well-read in anti-aging literature, independent thinkers, and open-minded readers who are ready for something deeper.

In my view, there are no quick fixes, no flashy solutions, no miracle cures, and no commercial product available today that can truly extend or improve life. The only one who can do that is you — using your mind, your choices, and the environment around you. And you don't need hundreds of tips. Just a few principles, clearly understood and correctly applied.

If you've read the book and have questions, thoughts, criticisms, or ideas — I welcome them. Please don't hesitate to contact me by email (can be found on the paperback back cover)
May you and your loved ones stay healthy and strong.

Longevity on Demand is not another overpromising guide stuffed with gimmicks or biohacks. It's a book for people who are tired of standard health and anti-aging advice — the kind that's either too vague to act on, too technical to understand, or disconnected from real life.
Many books flood readers with molecular pathways, supplement stacks, or conflicting advice. You're left overwhelmed — and unsure what (if anything) to follow. This book is different. It's written to empower, not confuse. To clarify, not preach. To go deep, but stay practical.
Drawing on biology, Systems thinking, and personal transformation, Longevity on Demand offers a fresh, grounded framework for understanding aging and reclaiming strength. You'll learn how your body really works — not just what to do, but why it works when you do it right.
Inside, you'll discover:


Why most anti-aging advice misses the point — and what matters more
The deep connection between muscle, energy, metabolism, and aging
How to use strength as a compass for vitality at any age
What your body is trying to tell you — and how to finally listen
What to beware of when hearing influencer advice
How to analyze new health material without getting misled
This book doesn't promise immortality or shortcuts. But it does offer something more valuable: clarity, logic, and a way forward that makes sense. Whether you're 25 or 75, if you're ready to stop outsourcing your health and start understanding it — this book is for you.

Evgeny Havkin PhD
Evgeny Havkin is a scientist, philosopher, mathematician, and health, fitness, and anti-aging enthusiast. Born in the former Soviet Union, he now lives in Israel, where he served in a military combat unit, further shaping his determination. With an "either it works or it doesn’t" mindset, he has spent over 20 years separating the wheat from the chaff in the health world. He studied biomedical engineering and behavioral neuroscience, earning a PhD for his mathematical analysis of aging and evolution. Combining wild experimentation in exercise and nutrition with a disciplined scientific approach, Evgeny is a fresh voice in the health sphere.
In his book Longevity on Demand, he invites conversations often absent in health and fitness genres.