F-Factor Diet Review

The F-Factor Diet is a four-week program that focuses on fiber, which is what the F in F-Factor stands for. Designed by nutritionist Tanya Zuckerbrot over the span of ten years, the program is broken up into three steps, with the first step lasting two weeks and the other two steps lasting one week each. According to Zuckerbrot, fiber being added to a person’s diet will help them feel more full throughout the day. As an added bonus, she contends that fiber improves energy levels, lowers cholesterol, and can even reduce the risk of some diseases. The F-Factor Diet is also billed as a diet for life, as opposed to a fad diet.

Do Dieters Lose Weight On The F-Factor Diet?

Dieters on the F-Factor Diet can lose weight in the short term.* This will likely be due to the fact that adding an abundance of fiber can help a dieter feel fuller, but will also help a dieter to move their bowels more freely. However, this type of weight loss will be minimal and short lived unless the dieter takes it upon themselves to add in proper nutrition and exercise on a daily basis. With anything, there will be both good and bad points when looking into a book like this, but many have said this book is misleading. There are many statements made by the author that explain that this is not a low carb diet, but in the first stage of the book almost 100% of the carbs are taken away form you leaving you only with fiber cereal and specific high fiber crackers. No yogurt or milk will be allowed in the first phase either, so you will most likely lose weight from taking away these three things, however it will not be easy. This is how the author expects you to live your life, low carb and a lot of veggies and lean meats. You will lose weight by doing this, but it is not realistic for people long term.

“She could have summed up the book in a few sentences: Eat high fiber cereal for breakfast and 2 or 3x a day have a high fiber cracker or 2 and you’ll get the fiber you need. She really never goes into detail on how to get more fiber through whole foods in your diet. The one good thing about this book is the recipes. They look fantastic! There are a lot of veggies in almost every recipe and they are very unique-I haven’t really seen these ideas before. So for me, the book was worth it for the recipes but for the actual “diet” it’s basically a complete scam.” April E. Gap*  She went onto say that there are a few pages dedicated to just fiber at the beginning but overall the recommendations were rather disappointing. Many cookbooks out there will give you fiber recommendations better than this author, which makes purchasing the book almost questionable.

Is The F-Factor Diet Easy To Follow?

The F-Factor Diet is not hard to follow. The book is laid out so that dieters can ease into the introduction of fiber, and it does do a good job of offering alternative snacks and foods that are rich in fiber. The theory of the diet itself is somewhat easy to follow, but the calculating is what is difficult to follow for most reading the book.  However, where the diet gets difficult is in the area of fitness. There is no guidance offered in the F-Factor Diet book, which means it really only covers half of the equation of weight loss. Like all good diet programs, it should be paired with an exercise program in order to be an effective solution for long-term weight loss. Many also said the program itself is just not sustainable for the long term which does not have me surprised. There have not been any real noted side effects when following this diet plan other than the recipes really not tasting good at all.


The F-Factor Diet book does ring true in many senses. Consuming more fiber will help you feel fuller to a certain extent, and it is a good idea to be on a diet that includes a fair amount of fiber. However, at $15 for the book, you are really getting little more than suggestions on ways to incorporate fiber into your daily diet. If more fiber is what you are after, you can simply buy a powder fiber supplement from your local grocery store and enjoy the same fullness benefit offered by the alternative foods in the F-Factor Diet book.* In addition, the program only covers diet, and markets itself as a permanent weight loss solution that we all know is false. While this is important for weight loss, you will be better off finding a program that offers both diet and exercise guidance so you can maximize your efforts.

*Please keep in mind that with any diet or weight loss program, individual results will vary.

Review Sources

So What Really Works?*

#1PS1000 ProgramReviewVisit
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*Individual results will vary.


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  • Brooke

    your “facts” are very wrong and make it clearly evident you haven’t actually read this book – as anyone who has, can tell you. The first phase is two weeks, phase two is in place until you have reached your desired weight and phase three is for life – making your claim that it’s a four week program, completely incorrect.

    Additionally – the no yogurt and milk part is only for the first two weeks, so again, you are incorrect.

    side note – the statement that eating an abundance of fruit and vegetables, with lean meats, for the rest of your life, isn’t realistic, is just wrong – lean meat, fruits, and vegetables are basically the foundation for majority of “diets” out there, along with the basic healthy eating suggestions by the USDA, so, to say that it’s unrealistic is just stupid.

  • Donna Teat

    I am curious as to why you indicate this is a 4 week diet? It specifically says there are 3 phases- phase 1 for 2 weeks, phase 2 until you get to your goal weight and phase 3 for maintenance. It even tells you that you get 36 cheat days/year (i.e. 10%), so I don’t understand the inference.

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