Can You Really Lose 23 pounds in 3 weeks?

Hi I’m Karen and I’m excited to be discussing my weight loss journey with you and describing how finally – after many, miserable, hungry and frustrating years of trying, I managed to lose weight to a point where I’m actually happy with my body.




I was a fat child. I was already chubby by the time I went to school. My parents said I would grow out of it, but I didn’t. In college, I was the fat one in our group, and I have to tell you, being the butt of their fat jokes not only hurt but really damaged my self-confidence.

I was embarrassed about my weight problem. I tried calorie controlled diets, high fibre (the Fart Plan) diet, low fat diets, juicing and workouts and all sorts of fad diets but nothing gave me the lasting weight loss. The most I managed to lose in one go was 17 pounds. And then of course, a couple of weeks of eating normally and the pounds piled back on again

Kate suggested I tried the 3 week diet plan. I love shopping online for digital stuff so I read some 3 week diet reviews to see how other people had found the program before I decided to try it for myself. You could describe me as skeptical but desperate. So here is my personal review which I hope will give you an insight into what this diet is all about.

What is the 3 Week Diet?
The three week diet promises fast fat loss.The 3 Week diet program has gained popularity in a very short space of time. The program was only developed back in 2015. It is basically a weight loss program that aims to achieve results very quickly. This diet program is designed so you lose weight fast – between 12-20 lbs in just 21 days – as long as you follow the diet to the letter.

The majority of people who start diet programs are simply unable to achieve their desired goal because they give up before they see the results they want. Diets which aim to reduce weight by two pounds a week are all very well but my motivation, like my willpower, declines pretty rapidly unless I have a compelling reason to keep going.

I’m not alone. Dieting for weeks with limited results demotivates people and they tend to give up. This was the reason that prompted Brian Flatt, nutritionist, personal trainer and the creator of the 3 Weeks Diet, to develop a system which accelerated weight loss and caused the body to burn fat rapidly.

Shedding the extra fat and then keeping up the momentum to maintain your weight can be difficult but the three week diet manual not only tells you what to do for 21 days but it also tells you what to do following the 21 days of the diet in order to maintain your new weight.

How does the 3 Week Diet Work?
The main body of the complete 3-week diet system is the diet program which consists of 4 different phases.

Phase 1 was the hardest for me. It lasted for a week and this was the phase in which I lost the most weight. I was 9 pounds lighter by the end of the week.

Phase 2 was for just 1 day but I also lost a pound this day

Phase 3 was from day 9 till 11. This was rather unusual and I lost another 3 pounds here.

Phase 4 was for the remaining days i.e. 12 to 21. The focus of this 9 day phase was to continue losing weight while returning to a more “normal” diet. I was another 4 pounds down by the end of the phase. So not as drastic, but effective none the less.

As so many weight loss programs are, it is both a diet and exercise program.  The exercise plan consists of a walk each day (not too strenuous!) and an optional workout which accelerates fat burning.


There’s no getting away from it. Phase 1 was hard. It’s a 3 meals a day version of a crash diet. It’s heavily restrictive in the types of food, and methods of cooking I was allowed to eat. Fortunately it did include unlimited amounts of some vegetables, so I was able to fill up on them in addition to the prescribed amounts of meat and fish.

I weighed myself every day and I really found it motivating to see the needle on the scales creeping down. It was a good job. I can’t deny that I was hungry and slightly cranky until I started to drink coffee again!

I also did the exercises. Again, not easy, but ticking off the days one by one, knowing that it was only for a short time made all the difference.

At the end of phase 1 I was beside myself with delight to see that I’d broken all previous records and lost 9 whole pounds. When I started phase 1 of the diet, it felt nearly impossible that I would keep going for the whole week without cheating – and OK, I did cheat  little. But after getting through the first week I felt quite elated and much thinner.

If you want to read more detail about how I got on with the diet read my weight loss diary

Phase 2
Phase 2 is a one day fast. After the restriction of the previous week it seemed like this would be hard, but honestly, I was shocked to find that this was one of the easiest days on the whole program. I think following the previous week to the letter had set me up for success. And again I was delighted to be another pound lighter by the following morning.

I would seriously suggest that when you buy the 3 Week Diet plan book just don’t skip the fasting phase. There is a rationale for the way the diet is put together and, much to my surprise, it really does work.

Phase 3
Protein is an important component of this diet's meal plansThis phase lasts 4 days and is without doubt the most unusual and counter-intuitive. So much so that I started to research it myself just to be sure I was doing the right thing! Fortunately I discovered that it wasn’t as wacky as I thought and there was indeed some solid science behind this phase of the plan.

I did find this phase quite challenging as it was the first where I’d had to calculate the calories I was eating. I discovered that it’s fairly easy to get calories values off the internet for just about any food you could think about and then it’s just a question of using weighing scales (more accurate than cup measures) to make sure your portion sizes are correct.

I didn’t lose quite as much weight as I expected on this phase, but I think it was because I didn’t start weighing things until the 3rd day when I noticed that my previous estimates of how much I should eat were way off base.

Still, another phase, another 1.5 pounds 🙂 And it would have been more had I planned it properly.

Phase 4 – The final countdown.
Phase 4 is the longest phase and lasts for 9 days. It involves a gradual return to a more normal healthy eating diet. How many calories you consume each day during this phase is based on your Body Mass Index or BMI.  There’s a section in the manual which explains how to calculate this from your body weight and height and then how to work out what you need to eat according to the result.

I continued to weigh myself every day and the pounds did continue to drop – albeit at a slightly slower rate. I was pleased however to return to a more normally balanced diet where no food was expressly forbidden (unless I’d skipped a page in the manual 🙂

I noticed that my belly fat was gradually disappearing and I my jeans were fitting less snugly – even after they’d just been washed! My waist had shrunk by 2 inches and I was I was able to tighten my belt by 3 extra holes.

By the end of the phase, I was another 4 pounds lighter.

Does This Fast Weight Loss Plan Really Work?
Absolutely. I followed the 3 Week Diet and, apart from a few cheats, I lost a total of 14.5 pounds (full before and after results here). I did all the mandatory exercise but not much of the optional workouts. I found the workouts quite difficult, but then I’m not at all fit to begin with. Despite it being hard, the amount of weight I lost in such a short period of time made it worth it. I'm sure I could have lost more if I'd planned better, exercised more and not cheated.

I had a break for a couple of weeks without gaining any of the weight back!! And then did the whole diet again. The second time around phase 1 was much easier – I think my body was used to it and I didn’t give up coffee this time. I didn’t lose quite as much weight, but I’m now 30 pounds lighter than I was 6 months ago and for the first time I can honestly say I’m happy with my appearance.

The double benefit is now I know how to maintain my weight and if I go mad on holiday and put on a few pounds, I know I can lose them again without too much effort.



What does this weight loss system consist of?
The Diet Manual is divided into four sections

The Introduction manual
The Diet Manual
The 3 Week Workout Manual
The Mindset & Motivation Manual
The Introductory Manual
The first book in the box sets the scene. It explains, in detail, what the diet is all about, the science and research behind the diet and metabolism. It also discusses the critical factors which you have to watch out for in order to ensure you lose the weight safely.  It talks about protein and all the other nutrients which are required for good health and speedy, successful slimming. Despite the fact it sounds technical it's written in layman's terms and is very easy to read.

The Diet Plans
The manual is easy to follow, and explains in detail what foods you are allowed and how they can be cooked in each different phase of the diet. It tells you exactly how much lean protein you should be eating and when you need to eat it.

There are however, a few notable omissions in the diet plan.  There's no mention of salads or any salad type vegetables.  I decided anything which used more calories chewing than it gave me should be included as part of a healthy weight loss diet.  A wider range of foods would offer a more nutritious diet, but then it might not give such rapid weight loss.

For phase 4 of the diet, you need to calculate your BMI and there is a a section in the manual which explains how to do this and how to use the result to work out how many calories you are allowed to eat in this phase. Fortunately, it is a simple and easy to follow calculation which I did using the calculator on my phone.



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