The complete protocol behind the science-backed fasting series on YouTube.
Get The Protocol
The belly, the flat energy, the fading drive — these are not three separate consequences of getting older. They are one metabolic problem speaking three different languages.
Eating less barely moves it. The visceral fat that settles after 40 sits deeper and behaves differently — and conventional dieting rarely reaches it.
Tired after a full night's sleep. Flat by mid-afternoon. Not a sleep problem — the predictable result of a body that is digesting something almost every waking hour.
Focus, drive and vitality thinning out year by year, and a doctor who calls the numbers "normal for your age." The research tells a more hopeful story.
Free videos tell you what to do. This book tells you why it works, which fast fits your life, what to eat when you eat, and how to build a rhythm that holds for years — not one trick you abandon by Thursday.
You've watched dozens of fasting videos and never followed one structured plan long enough to see it work.
A progressive 30-day system that layers the fast, the food, the training and the sleep — each week building on the last.
A flatter waist, steadier energy and better hormonal numbers — not from one trick, but from a body that finally burns its own fuel.
When you eat all day, one hormone — insulin — never comes down. And while insulin is high, your body physically cannot reach its own fat. The door stays locked. Give it a real stretch without food, insulin falls, the door opens, and the fat finally burns.
Researchers call it the metabolic switch. Most men past 40 never flip it once in a week. This book shows you how to flip it every single day.
Understand insulin, the locked door, and why constant eating keeps the switch off.
Follow your own body hour by hour — from the last bite to a full day without food.
Build the daily rhythm that flips the switch without hunger running your life.
Every part is explained with the exact mechanism, the exact timing, and the exact progression — so you know what to do from day one.
Week one begins with one change: stop eating after dinner. The window, the food rules, the training and the longer fasts are layered in gradually, as the rhythm becomes familiar.
16:8, 18:6, one meal a day, or a weekly 24 — what each one actually does, and which one fits your job, your family and your body.
What you eat first decides whether the fast paid off. What genuinely breaks a fast, what doesn't, and the first meal that doesn't undo the morning.
Protein targets for a body over 40, plate templates for your window, and how to lose fat without losing the strength you still have.
Training on an empty stomach, and the two things — poor sleep and unmanaged stress — that quietly cancel out everything else you're doing right.
No guesswork. The plan tells you exactly what to do each week — and what to expect as your body adapts.
Stop eating after dinner and reach 14:10 gently. This week should feel almost easy — that is the point.
The week most men meet the wall — and the week most men notice the afternoon fog lift on the other side of it.
Hit your protein target, add one longer fast, start walking daily. Fasting stops feeling like an effort.
The full rhythm, adjusted to your life. Measure your waist against day one — that number is your proof.
Eighteen chapters across five parts, plus a complete quick-reference toolkit. From the biology of insulin to the exact daily protocol, what breaks a fast, plate templates, troubleshooting and the 30-day plan.
Chapters 9–18 continue through the first two weeks, breaking a fast, what to eat, fasted training, sleep and stress, the mistakes that stall progress, fasting after 60, and the full 30-day plan.
Why three meals plus snacks is a modern factory invention — and what your body was actually built for.
The honest testosterone story, including why the "1–2% a year" decline is mostly not the calendar.
Insulin, the locked door, and the metabolic switch that never flips for a man who eats all day.
A timeline of your own body from the last bite through a full day without food.
What fasting does to male hormones — and what the research genuinely supports, without the hype.
Autophagy told honestly, including the popular timing claims the science does not actually support.
Why visceral fat behaves differently after 40, and what finally reaches it.
16:8, 18:6, one meal a day or a weekly 24 — what each does and which one fits your life.
Most fasting books repeat the same confident numbers: autophagy starts at exactly 16 hours, testosterone rises by a fixed percentage, the scale drops every week. This book checks those claims against the actual research — and tells you plainly where the evidence is strong, where it is thin, and where it is folklore.
You get the mechanisms that hold up, the honest caveats, and named sources you can look up yourself. That is the difference between a protocol you can trust for years and a list of tips you abandon by Thursday.
Real citations from named researchers and journals — not invented statistics.
Straight answers where the science is genuinely uncertain, instead of false confidence.
A chapter written specifically for men in their 60s, 70s and beyond.
Real progress follows a pattern.
Here is what to expect.
The first days are about the habit, not the results. You stop eating after dinner, you notice how often you ate out of routine rather than hunger, and the window starts to feel normal.
Hunger stops arriving on the old schedule. Most men report the afternoon crash easing first — the clearest early sign that the body has begun reaching for its own fuel.
Fasting stops being a thing you do and becomes the way you eat. The waist is the honest measure here — slower than the scale, and far more meaningful.
These are unedited comments from the Life by Science channel — the same evidence-based approach this book is built on.
18 chapters. A complete quick-reference toolkit. A 30-day plan. Free lifetime updates — at $19 instead of $50 while the discount lasts.
This discount is ending soon. The regular price is $50.
Questions men ask before ordering.
This book is built on the same evidence-based approach as the Life by Science channel — followed by more than 34,000 people for clear, honest health guidance, with no supplements to sell and nothing to hype.
Here that approach is consolidated into a single organised protocol, so you no longer have to assemble it video by video and hope the pieces fit together.
Give your body thirty days and see what it is still capable of. At $19, with a full money-back guarantee, there is very little to lose.
Get The Protocol — $19The Fasting Protocol for Men Over 40 is a digital ebook (PDF). It is delivered instantly as a download after payment. Nothing physical is shipped.
Your purchase gives you a personal, non-transferable licence to read the book on your own devices. You may print a copy for your own use.
You may not resell it, share it, upload it to file-sharing sites, or distribute it in whole or in part. The text, images and design remain the property of Life by Science.
Payment is handled by Gumroad, who process the transaction and deliver your download link by email. We never see or store your card details.
If your download does not arrive, check your spam folder first, then contact us and we will send it directly.
Covered by a 7-day money-back guarantee. See our Refund Policy.
This book is educational. It is not medical advice and is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Speak to your doctor before beginning any fasting programme — particularly if you take medication, have diabetes, low blood pressure, a history of disordered eating, or any ongoing medical condition. Fasting is not suitable for everyone.
We make no promise of any specific result. Outcomes depend on your starting point, consistency, health and many factors outside our control. The comments shown on this site are individual experiences, not typical or guaranteed results.
These terms may be updated from time to time. The version on this page at the time of your purchase is the one that applies to you.
We collect as little as possible. We do not sell your data, and we never see your payment details.
Your card number, CVV or bank details. Those go directly to Gumroad’s payment processor and never touch this website.
This site uses Google Analytics cookies to count visitors and see which sections people read. There are no advertising or tracking-network cookies here.
You can block them with your browser settings or Google’s opt-out add-on. The site works perfectly well without them.
Nobody else receives your information.
You can ask us what we hold about you, ask for it to be corrected, or ask us to delete it. Email us and we will action it. Purchase records held by Gumroad may need to be kept for tax and accounting purposes.
If the book does not deliver value for you, email us within 7 days of your purchase and we will refund you in full. No questions, no form to fill in, and you do not need to justify your decision.
Email from the address you used to buy, with your Gumroad receipt or order number. That is everything we need.
Because the book is a digital file we cannot take it back, so we simply ask that you delete your copy and do not share it. We trust you on that.
If the download failed, the file will not open, or the email never arrived, contact us before asking for a refund — that is almost always fixed in minutes, and we would rather you had the book.
We read every message and usually reply within 1–2 business days.
We cannot give personal medical advice, review your bloodwork, or tell you whether fasting is safe for your particular condition. That has to come from your own doctor, who knows your history.
The channel: Life by Science on YouTube
Order and download issues can also be raised through your Gumroad receipt.