This 3 Week Diet review seeks to peel back the curtain on the diet that’s caused a stir on social media and message boards and ask the simple question, “Does the 3 Week Diet work?”

This in-depth review takes a look at every aspect of the product and determines the pros and cons and makes a final unbiased recommendation so you’ll know for sure if it’s for you or not.

What is the product?

To quote the website (which you can find at, the 3 Week Diet is a foolproof, science-based diet that’s 100% guaranteed to melt away 12 to 23 pounds of stubborn body fat in just 21 days.

That’s a bold claim indeed, especially for an internet based digital product of which there are many, some of which have no real scientific basis behind them and are all hype and no content.

Who is the author?

Brian Flatt is the creator of The 3 Week Diet and he is a sports nutritionist, personal trainer and health coach – A nice well rounded skills set to create a product of this nature.

With a degree in biology from San Diego State University, Flatt has been in the fitness industry since the 90’s and he is also the owner of REV Fitness which is based in Southern California.

What is included in the program?

The program consists of four key manuals which cover individual aspects of the program:

Introduction manual – This manual is where you start and it breaks down the science behind how the body stores and burns fat and explains what you need to do to lose fat. It also covers the supplements recommended with the diet.

Diet Manual – This contains the information needed to ensure you have a personalized diet plan for your body. It also shows you exactly what you need to eat and which foods you need to avoid at all costs because they shut off fat burning.

Workout Manual –Whilst optional, Flatt states that including the workouts helps you double your results so it is recommended. They consist of home based workouts but there is also a gym based version.

In total it takes 20 minutes 3-4 days per week which is great because it doesn’t require you to spend hours strapped to a treadmill.

The manual also includes a killer ab workout called the Midsection Miracle Workout which has two ab exercises that are all you need to chisel a washboard stomach.

Mindset & Motivation Manual – This is an important addition and one that not many other diet programs include. This is where results start. Our results are tied to our actions and our actions are driven by our habits, our habits are driven by our thoughts and our thoughts are driven by our feelings.

For this reason this manual helps you rewire your brain and gets you to think about fat loss in a different way. By doing this it ensures that your thoughts and feelings about your 21 day challenge are positive which reinforces positive action. It is this consistent action which generates the results.


Click Here To Download The 3 Week Diet

How does it work?

Getting started is incredibly easy. Once you’ve made payment you download the manuals instantly and then start calculating your personalized diet plan which is easy to do.

You’ll then read through the four manuals and you’ll then have a full nutrition and workout plan within an hour and you’ll have everything you need to start tomorrow.

Who Is the Ideal Candidate for the product?

The good thing about this diet is that it is accessible to everyone regardless of your age, body type or ethnicity.

Similarly, it also works regardless of your style of eating so even vegetarians and vegans can try the diet.

The people this diet will be best suited to are people who are sick of trying multiple diets and not getting the results your effort deserves. If you’re determined and commit to sticking to the plan as laid out for 21 days and you want to lose 12-23 pounds in that period then you are a good candidate provided you can commit to four twenty minute workouts per week.

On the flip side, if you think it’s a magic pill which you can buy and then sit around waiting for it to work its “magic” then this isn’t for you. As with all diets there is a requirement for you to change your habits as the habits that got you where you are today won’t enable you to get to where you want to go.

For that to happen you have to dedicate yourself to forming new habits that will take you to the promised land.


  • Fast 12-23 pound reduction in bodyweight and 2-3 dress size drops
  • Excellent health benefits including decreased cellulite, increased energy and improved cholesterol levels
  • Instantly downloadable
  • Short, home based workouts
  • Motivation manual
  • 60 day Guarantee


  • Some additional costs as some supplements are recommended
  • No hard copies of the products available
  • Topics could be covered in more depth
  • More scientific references could be included

Does The Product Work?

The product has a “Doctor Trusted” seal of a approval, though when you consider that most doctors receive less than 3 weeks of nutritional training you may wish to take that with a pinch of salt.

There are a number of testimonials on the homepage from people with impressive results such as 17 pounds lost in 12 days, 23 pounds lost in 21 days and 11 pounds lost in one week amongst others. We have to take it that these are genuine testimonials and if they really are then the results are impressive.

The biggest indicator of the program actually working is the 60 day “Lose Weight or it’s FREE” guarantee which offers a full refund within 60 days if you don’t lose the weight promised. This is a nice factor which provides comfort for those on the fence.

Finally, the homepage contains a Facebook recommended counter with over 7000 recommendations.


Overall there is a mixed view here given the fact that the manuals themselves are light on science (despite the author being a Biology graduate), however, we accept that this may have been done to keep it actionable for the people who buy it.

The fact that it is instantly downloadable and has an extensive guarantee is positive and based on that we suggest that anyone who fits the target profile should feel comfortable trying it out as they truly have nothing to lose.