- Vegetarian and Keto options
- Nutritionist-made with macros and calorie counts
A personal trainer, nutritionist and member-only app, ready when you are.
7 day free trial
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Developed by Dr Michael Mosley and a team of nutritionists and doctors following the latest science, our step-by-step programme helps you lose weight fast and keep it off. With tailored meal plans, workouts and support we make it easier to get healthier and activate your body’s ability to burn fat.
We've helped over 100,000 people just like you lose weight, keep it off and improve their health
Calli lost 3 stone 4 pounds (21kg) and found freedom from all medication.
Jill lost 4 stone 10 pounds (30kg) and found better mobility with less knee pain.
Garry lost 4 stone 12 pounds (31kg) and found out how much he loves running!
Jan lost 2 stone 11 pounds (18kg) and started swimming again.
Jennifer lost 2 stone 12 pounds (18kg), as well as her headaches and asthma. She found her blood pressure in the normal range.
Pavel lost 9 stone 9 pounds (63kg) and put his pre-diabetes into remission.
Helen lost 3 stone 4 pounds (21kg), as well as her pain and thyroid issues. She found more energy!
12 week programme
( – select your currency when you sign up)
This gives you access to the 12-week programme plus one extra month of membership to The Fast 800. After that, your ongoing monthly membership is . You can cancel this monthly membership at any time. *This price structure is only available via the website.
Start your personalised programme now with your first 7 days absolutely free
Sign up today and your free trial begins immediately. Week 1 of your programme will start on:
Monday 16th December
Join today!Our low-carbohydrate, Mediterranean-style meals are nutritionally balanced to keep you fuller for longer and promote rapid fat burning. They are easy to prepare and of course, taste great!
vegetarian
vegetarian
vegetarian
Your body mainly runs on two types of fuel: sugar (in the form of glucose) and fat. When it uses glucose, fat is stored in the body.
When you have more glucose than your body needs for energy, it eventually gets stored as body fat. This commonly happens when someone eats a high-carbohydrate (sugar & starch) diet.
When you eat a low-carb diet, your body has less glucose to run on. So, it starts to use your fat stores instead. You can fast-track this process by intermittent fasting.
The Fast 800 Programme will teach you how to combine delicious food with intermittent fasting so you can burn through excess fat stores and return your body to health.
Click on the timestamps to see how the typical body responds over 12 weeks to our most popular approach
You may see a stabilisation
Less hungry, with more energy and motivation
Potential weight loss
Fat
The body is likely in ketosis, and is adapting well to using fat as fuel. Motivation to continue will increase as the scales start to shift. Weight loss will differ from person to person.
You will see a stabilisation
You may feel more positive
Less hungry with more energy and motivation
Fat
Metabolic health is improving. Your body is using energy more effectively and is able to switch between glucose and fat for fuel. Weight loss may stall for a few weeks, which is normal as the body continues to adjust.
You should see a stabilisation
Sleeping well. Sustained energy and motivation
Sustainable weight loss
Fat
You're in a good routine and have sustained energy for exercise. Your metabolism switches between glucose and fat burning easily. You may see a return to stable weekly loss of around 1lb/0.5kg a week.
You should see a stabilisation
Strong and motivated to continue with your health goals
Overall, significant weight reduction
Fat
Your body can now use the energy from your food efficiently. Insulin sensitivity has improved, meaning less insulin is required to control blood sugar levels. Your health is on track and you can feel the difference!
A nutrition and lifestyle programme to activate your body’s natural ability to burn fat rapidly and facilitate your journey to long-term, sustainable weight loss.
Developed by nutritionists and doctors, including Dr Michael Mosley, following the latest science. The Fast 800 is an independently validated programme designed to kick-start your body’s own weight-loss mechanisms and help you lose weight quickly, improve your metabolic health and live longer.
Our step-by-step programme is simple to follow, providing delicious recipes, designed to flip your metabolic switch and burn through your fat stores.
Starting a weight loss journey is a big step. Our 12-week weight loss programme is here for people who want clear results in an easy-to-follow way. With this 12-week weight loss plan, you get a complete guide that looks at exercise and eating right, making sure you make the most of each day.
The good thing about a 12-week weight loss workout plan is that. As the weeks go by, If you’re ready to start this exciting journey, our 12-week diet plan is here to guide you. Let’s dive into what it offers.
Everyone’s journey to weight loss is different, and that’s why our 12-week weight loss programme is designed to fit individual needs. By merging the main ideas of weight control with a plan made just for you, we provide a 12-week weight loss plan that works for everyone and yet feels personal.
Our members often say that this personalised approach helps them to feel seen, supported, and inspired as they move forward in their 12-week weight loss journey, seeing real changes as they go.
Choosing the right time to embark on your weight loss journey can make all the difference. Our 12-week weight loss plan has been thoughtfully crafted to offer an optimal duration. With the 12-week weight loss programme, there’s ample opportunity for you to establish and reinforce healthy habits. Yet, it’s succinct enough to ensure you remain motivated and consistently observe the transformative results you crave.
Our 12-week diet plan paired with the 12-week weight loss workout plan provides a clear and comprehensive guide. Each stage is meticulously planned out, getting rid of any guesswork. So, with every day that passes, you’ll be confidently moving forward, certain of your next step.
The beauty of a 12-week weight loss journey is its tangible results. As you progress week by week, you’ll not only feel the difference but see a rejuvenated version of yourself emerging.
What sets our 12-week weight loss programme apart is its foundation in scientific research. This commitment to evidence-based methods, which are also delicious and achievable, ensures you’re in reliable hands as you journey towards a healthier you.
12-week programme
$199 $159 AUD
(£119 £95 GBP / $149 $119 USD – select your currency when you sign up)
This gives you access to the 12-week programme plus one extra month of membership to The Fast 800. After that, your ongoing monthly membership is £12 GBP / $22 AUD / $15 USD. You can cancel this monthly membership at any time. *This price structure is only available via the website.
As you embark on our 12 week weight loss plan, each week promises fresh challenges and notable milestones. Here’s a brief overview of your journey:
Start your personalised programme now with your first 7 days absolutely free.
Delicious meals to enjoy, not endure
All approaches of The Fast 800 incorporate low-carbohydrate, Mediterranean-style meals that keep you fuller for longer and promote rapid fat burning. Our meal plans are nutritionally balanced, include a variety of easy recipes and of course, taste great!
Finding a programme that works for you is so important in maintaining a healthy lifestyle long-term.
Dr Michael Mosley explains the biology behind weight loss:
Your body runs on two different types of fuel: glucose (i.e. sugar) and fat. Your body only turns to major fat burning for fuel when glucose supplies (which are stored mainly in your muscles and liver in the form of glycogen) start to run down.
Many of the foods we eat are high in carbohydrates, which contain more glucose. If you eat a lot of high carb snacks or food during the day, your body will be busy burning glucose, not your fat stores. When there’s more glucose in the body than can be used, it triggers fat storage.
Less carbs. By eating less carbohydrates as part of your 12-week diet plan, your body naturally has less glucose to burn.
Less calories. By consuming about 800 calories each day, your body can swiftly burn through your glycogen stores and start burning fat instead.
Less often. By eating less frequently, your body can remain in the fat burning zone for longer.
If you’re set to dedicate yourself, to invest the effort, and to savour the benefits, our 12-week weight loss plan is ready for you. Embrace the 12-week weight loss workout plan and the 12 week diet plan, paving the way to a fitter, more healthy version of yourself.
The Fast 800 is the UK’s leading destination for fast and effective weight loss. Our scientifically-backed weight loss programme is designed to help you achieve your health goals swiftly and sustainably. Whether you’re looking for quick weight loss solutions or a comprehensive online weight loss program, The Fast 800 offers a personalised approach to meet your unique needs.
Experience the power of change with The Fast 800. As a leader in fast weight loss in the UK, we are committed to guiding you through a journey of quick and effective weight loss. Our tailored online weight loss programs are designed to fit your lifestyle, ensuring sustainable success. Join The Fast 800’s weight loss programme today and start your journey towards a healthier, happier you. Your transformation awaits!
Embark on your health journey today with The Fast 800 – the ultimate destination for fast weight loss in the UK. Join our comprehensive weight loss programme and be part of a thriving community benefiting from our online weight loss programs. Together, we’ll achieve quick weight loss results while laying the foundation for lasting health and wellness. The Fast 800 is more than a diet; it’s a pathway to a healthier, more vibrant you.
Based on data collected from 23,000 members
6kg 3 mths
Members following the online programme for at least three months lost an average of 6kg
7.3kg BMI > 30
Members who started with obesity (BMI >30) lost an average of 7.3kg after three months
Members with a BMI ≥ 30 were likely to sustain an average weight loss of 8.7kg at 12 months.
Members with a BMI ≥ 30 saw a significant reduction (on average 4.7cm after 12 weeks) in waist circumference, which is linked to significant health benefits.
Of members with pre-diabetes with a BMI ≥ 30, 61% had blood sugars returned to normal after 12 weeks.
53% of members with type 2 diabetes had blood sugar levels that were no longer in the diabetic range after 12 weeks.
55% of members with type 2 diabetes, but a healthy BMI, saw their blood sugar levels reduce to be outside of the diabetic range.
The average decrease in HbA1c values within the diabetic member group was 28 mmol/mol, which is clinically significant.
Browse through our most commonly asked questions
Joining is as easy as clicking here in order to join via our website, OR making payment via the Google Play / App Store. (Search for The Fast 800!)
If you join via our website, you will pay £119 / AUD$199 / USD$149 for your initial 12 weeks’ access.
Access thereafter is at £12 / AUD$22 / USD$15 per month. This payment will renew automatically until it is cancelled. You can stop your membership at any time via your Profile page.
To take advantage of more payment options (including a monthly format) or to pay in your region’s currency, you may wish to pay via the Google Play / App Store. Simply proceed through the signup and checkout process to see pricing options.
Please note:
Our Programme teaches you the health benefits of a moderately low-carb Mediterranean-style diet, so it becomes a way of eating for life. It is based on the latest science and takes an evidence-based approach to healthy living focusing on nutrition, movement, behavioural change and sustainable lifestyle.
It includes:
Your programme for weight loss and long term health starts straight away.
When you click “start now”, you’ll be asked to create an account. Once your account is set successfully, please go through the checkout process, which requires you to enter credit card details, to trigger your access to the personalisation quiz and the start of your 7-day free trial.
Your credit card will only be charged if you do not cancel prior to the end of the trial period.
Please note, once you cancel the free trial, you will lose access to your account straight away.
The Fast 800 programme is not recommended for the following:
Please read our medical disclaimer for additional information.
The DIAMOND Study performed by Oxford University and Dr Clare Bailey looked at the feasibility of using an 800 calorie, low-carb, med-style diet as a treatment for people with type 2 diabetes.
After 8 weeks the average weight loss was 9.5kg, sustained over the course of the trial.
Results also included a significant drop in blood sugars, blood pressure and the use of medication.
As the Programme is guided, you are unable to pause or restart the course.
You can view content from previous weeks and you also receive a free four week trial of the monthly subscription service at the end of the 12-week Programme, to allow you to catch up on any missed content.
Please be aware that Week 1 starts the Monday following sign-up. The time in between sign-up and Week 1 is called the Prepare period, and is designed to give you time to have a look around the Programme, start planning your shopping list and recipes, try a workout or two, and get used to how the programme runs and works.
Please ensure that you are signing up according to how much Prepare time you would like before Week 1 commences – for example, if you would like a full week of Prepare time, please sign-up on a Monday or Tuesday, and if you would like to start Week 1 right away, please sign up on a Saturday or Sunday.
If you have any issues with the start date of your programme, please get in touch via our Contact Us form.
800 is the generally accepted number of calories used to achieve weight loss in scientific studies. Professor Roy Taylor, leading researcher into the reversal of type 2 diabetes, used 800 calories in his test group in the DiRECT Trial.
We have found that 800 calories is high enough to be manageable for most members, but low enough to trigger a range of desirable metabolic changes.
No, you don’t have to give up any of these whilst following the Programme although, obviously, we would certainly advise everyone to stop smoking as soon as possible, irrespective of their blood sugars.
Coffee and alcohol are still allowed on the programme although the calories in both of these drinks need to be included in the daily calorie limit (noting that alcohol is highly calorific).
A pint of beer or a large glass of wine contains 180 calories, so really best avoided or kept to a minimum.
The good news is that red wine is included in the Mediterranean-Style diet, so once you finish The Very Fast 800 and The New 5:2, and move onto ‘The Way of Life’ approach you will be able to introduce alcoholic drinks back into your lifestyle (we go over this in more detail in the Programme learning content).
Black coffee and tea are fine although you will need to include any milks in your daily calorie count.
Still got questions? Please visit our full FAQ page here or contact us and we’ll get back to you!
7 day free trial
Join today!