Book review Book reviews

#Bookreview Z-FAST: A Simple, Proven Intermittent Fasting Method by John Zehren An honest, simple, and clear explanation of intermittent fasting as a weight loss method and good tips on how to implement it. #weightloss #diet

Hi all:

This is not one of my usual reviews, but I felt curious about this book and I thought I’d share it with you. As I say, I haven’t had a chance to try the method yet, but perhaps I’ll revisit it in the future.

Review of Z-Fast by John Zehren
Z-FAST: A Simple, Proven Intermittent Fasting Method by John Zehren

Z-FAST: A Simple, Proven Intermittent Fasting Method by John Zehren

Learn How Intermittent Fasting Can Help You Ditch the Diet Merry Go Round and Lose Weight for Life!

Fasting for weight loss is the cure for the avalanche of yo-yo diets, fads, pills, programs, equipment, and machines that offer empty promises to lifelong weight loss. Author John Zehren’s new book, Z-FAST: A Simple, Proven Method of Intermittent Fasting describes his new program for periodically skipping meals to help dieters win the battle against weight gain. Portioning, long hourly workouts, calorie counting, special meal programs, and massive weight loss fads do not work, and Zehren offers compelling evidence for why these other methods fail.

John says, “I had NO time to exercise and NO time for diets. I only had time NOT to EAT. FASTING WORKS.” In Z-FAST, John shares the story of his successful fasting weight loss, the three personalized, proven methods for fasting, and the many health-boosting benefits that come with what has been discovered to be a natural way of eating. This book contains the answers for all those people who have asked over the years, “Hey Johnny Z, can you write that fasting thing down for me?”

Z-FAST is a practical approach to weight loss consisting of a simple formula where skipping meals several times per month helps dieters achieve life-changing results. Z-FAST chronicles the newly discovered health-boosting benefits of intermittent fasting. Stored fat is burned, and the reduced caloric intake results in weight loss while shrinking the stomach muscle. There is substantial evidence of improved heart health for fasters, and regular fasting and better heart health is linked to the way the body metabolizes cholesterol and sugar. Fasting reduces the risk of weight gain and the potential to develop diabetes (two known risk factors for heart disease) while lowering blood insulin and blood pressure and increasing metabolism.

Some of the advantages of intermittent fasting include…

  • Visible Immediate Weight Loss
  • No Portioning Required
  • No Dieting Every Day
  • Burns Stored Belly Fat
  • Better Sleep on Fast Days
  • Shrinks Stomach
  • Not Relying on Exercise
  • No Counting or Measuring
  • Eat Normal 90% of the Time
  • Greater Concentration on Fasting Days
  • Win the Battle & Keep the Weight Off
  • Metabolic Rate Boost
  • Improve Insulin Levels
  • Improve Heart Health
  • Live Longer

Stop dieting and start living. Pick up your copy of Z-Fast today!

Editorial Reviews


HUGEOrangePublication Review
Z-Fast, byJohn Zehren

Fasting is an ancient art and has been practiced for thousands of years. Buddhists, Jews, Muslims, Christians all have fasting rituals. You may have wanted to try fasting for better health, religious reasons, or to lose weight but have hesitated because of scary information out there. Some say fasting puts your life in danger or makes you gain more weight. And hey, isn’t breakfast supposed to be the most important meal of the day?
Author John Zehren found himself overweight and unable to lose pounds after trying lots of popular diets. In frustration one day he vowed not to eat anything until he weighed under 200 lbs. He lost 5 lbs. right away and had stumbled into fasting.
I didn’t have time to exercise (well, not enough to lose weight) … and I didn’t have time to manage and stick to a special diet. But I did have time NOT to eat … and that is where the weight loss magic finally happened.
After losing 40 lbs. and keeping it off for years, he decided to share what he learned about fasting and how it worked for him. Z-FAST: A Simple, Proven Intermittent Fasting Method is a great guide for those wanting to dip their toes into the world of intermittent fasting as well as those who already enjoy the benefits and want to learn more. He covers just about any fact on fasting you can come up with and provides good, solid tips on how to start and stay with it.
I don’t possess a great deal of discipline when it comes to continuously portioning my food on a daily basis for life (like all the other diet fads require you to do).
He covers the science of it; how it works in your body; effects on your heart; cell, gene and hormone functions; and lots of other facts. If you want to start, you’ll learn about three different fasting methods and how they work together or separately. The methods and tricks he’s used over the years just might work for you too as they seem common sense and realistic. This is a guy who feels great, looks great, and is willing to share the secret of how he did it, why he did it, and exactly what it is with others. What do you have to lose? Give it a try and you might write your own book on a miracle. Recommended for all as a good addition to any library on health and weight issues.
You’ll have a lifetime commitment to your ideal weight and health WITHOUT using any fancy diets or extreme exercise regimens.

Author John Zehren
Author John Zehren

About the author:


John graduated with a degree in Biology from the University of St. Thomas in St. Paul, MN. For more than 35 years, he has been employed in the medical and healthcare fields working to bring new cures and FDA approved technologies to the market, specializing in the heart and brain. Currently, John is the North American Vice President of Sales for the Neurovascular Division of a major American healthcare company.

As a busy medical device executive who has a demanding career, John has discovered the secrets to what it takes to live a vibrant and full life. John has been happily married for over 26 years, has raised three daughters with his wife, and enjoys living in Southern California as an avid surfer. John is often described by those who know him best as an innovator, highly motivated, fun-spirited and someone who never takes “No” for an answer.

After being asked about a million times how he manages to stay so fit, author John Zehren decided to share his passion for living life to the fullest and disclose a secret he has discovered. This resulted in the release of his new book, Z-FAST: A Simple, Proven Intermittent Fasting Method. John found that using the methods of Z-FAST allows him to maintain excellent health both physically and mentally.

John says, “I had NO time to exercise and NO time for diets. I only had time NOT to EAT. FASTING WORKS.” In Z-FAST, John shares the story of his successful fasting weight loss, the three personalized, proven methods for fasting, and the many health-boosting benefits that come with what has been discovered to be a natural way of eating.

For more information, contact John at or visit

My review:

I must confess that I have struggled with my weight from very early on (well, all my life) and, like the author of this book have tried (or read about) a variety of diets. In my case, if something doesn’t make sense to me, I don’t try it, especially if it is something long-term. (I am a doctor but I’ve worked mostly as a psychiatrist, and I cannot claim specific expertise on this subject, even if I’ve read plenty about it). I have been hearing about intermittent fasting for quite a while and know people who have tried some versions of it (like eating only 500 calories two days a week), and I felt curious when I saw this book on offer for free. After all, fasting has a long tradition and plenty of people and cultures adhere to it, in one fashion or another.

The book is easy to read (I read it all in one evening), and although it is packed with information, it is not overly complicated. There is some degree of repetition because some of the information is relevant to several of the points the author discusses but does not get excessive or boring. The style of writing is conversational, and it is easy to imagine that you are talking to the author, who comes across as a knowledgeable and likable person, fully convinced of the goodness of the method, and interested in sharing it with as many people as possible. I’d recommend checking a sample of the book to make sure it suits the reader’s taste.

While many books of this kind try to sell you something (a method that involves subscribing and paying for a programme or buying supplements or other books, foods to be delivered at home, an exercise programme), this is not the case here. The author clearly states that he does not have time to prepare elaborate meals or to exercise for hours on end, but what he can do is not eat. The plan might not suit everybody as it does require a big deal of discipline and strong will (most diets do) but it is pretty flexible, and it makes sense. Different people feel differently, but for some, it might be easier to have nothing at all to eat at times than to try to restrict the amount of this or that or engage in very complex routines. The book contains testimonials from a variety of people who have tried fasting as a method to lose and control their weight and have found it useful, some for a large number of years. I particularly liked the idea of having an emergency plan and making a strong commitment to take action if the weight goes over a certain level. Personally, I cannot say if the plan works or not as described, but I’d recommend the book as an interesting read for people considering fasting as a method to control their weight.

My only warning would be that readers must pay attention to the fact that the book mentions that it might not be a suitable method for people with certain medical problems as it does not place a lot of emphasis on that aspect. I’d recommend anybody with chronic health conditions or taking regular medication to check with their physicians before attempting this.

An easy-to-read book that proposes a simple weight loss and maintenance plan that will particularly appeal to those with little time and who prefer simple options (not easy, though).

Thanks to the author for the book, thanks to all of you for writing and remember to like, share, comment, click, review, and keep smiling!

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