More than a diet programme
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Education on science-based lifestyle best practices
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Easy and delicious nutritionist-developed recipes
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Tailored exercise and meal plans
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Personalised tracker and exclusive community
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FREE 7-day trial, start today!

Weight loss and fasting nutrition
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Keep you full and satisfied
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No added sugar or simple carbs
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High in protein, fibre and quality fats
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100% vegetarian and made from natural ingredients
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Essential vitamins and minerals

Natural weight loss and fasting products
The Fast 800 Shakes are developed to give the nutrient blend to keep you full and satisfied throughout the day.

Pawel's sustainable weight loss
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Lost 63kg
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Pre-diabetes into remission
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Used programme alongside weight loss medication
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Blood pressure improved
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Stopped snoring
Intermittent fasting success stories
We’ve helped over 120,000 people just like you lose weight, keep it off and improve their health

Losing 21kg has given me a new sense of freedom, and I'm finally off all my medications.

The programme flexibility is the main reason for our success - we've lost 51kg between us.

I was on two separate medications and by the end of the 12 weeks, I had dropped down to one.

Losing 6 stone (38kg) has absolutely changed our lives.
As seen in







Our story
Dr Michael Mosley was a pioneer of intermittent fasting. In 2018, he co-founded The Fast 800 with Dr Clare Bailey Mosley to make scientifically-based weight loss and health strategies accessible to more people.
In continuing his father’s legacy, Dr Jack Mosley has written a book to emphasise the importance of sustainable diet and lifestyle habits alongside weight loss injections. We commend his writing to support weight loss medication users achieve long-term success.
Our programme and health support products, including meal replacement shakes, help people lose weight, stay healthy, and live longer and are compatible alongside weight loss medications like Ozempic and Mounjaro.
Try the Programme for free
Sign up today and your 7-day free trial begins immediately. Week 1 of your programme will start on: Monday 23rd June
How much does the programme cost?
Joining is as easy as clicking here to join via our website, OR making payment via the Google Play / App Store (search The Fast 800).
Joining on the website
To join our 12-week guided Programme via the website, you will pay per month for three months. This includes a 7-day FREE trial.
Once you have completed your 12-week Programme, you will receive a bonus FREE month of Graduate Support Membership to continue or maintain your results.
You will automatically transition to our monthly Graduate Support Membership for per month, unless you cancel before the end of month four.
Once you are in month five, you may cancel anytime.
Joining on Google Play or the App Store
The pricing structure and membership options are slightly different on the app stores, simply proceed through the signup and checkout process to see available pricing and membership options. You can also take advantage of paying in your region’s currency on Google Play and the App Store.
Please note:
- All offers are ONLY available through website signups for new members
- You can still download and use the app once you have signed up via our website
What's included in the Programme?
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.
The Michael Mosley diet includes:
- Education around science-based lifestyle best practice
- Weekly, time-saving meal plans – vegetarian and non-vegetarian – with automated shopping lists
- The Very Fast 800, The New 5:2 and The Way of Life approach plans, some with Keto options
- Exercise plans, incorporating HIIT and resistance training, designed for beginner to advanced levels as well as a library for further stretching, yoga and pilates videos
- Trackers to measure waist, weight, HbA1C, mood and sleep
- 900+ easy and delicious, nutritionist-developed recipes
- Mindfulness meditations
- Core learning content, plus access to exclusive articles
- Support tools for liaising with your usual treating doctor
- Access to a lively Community so you can chat with your fellow members and/or ask our online health coaches for support
How does the free trial work?
Your programme for rapid 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.
Who should avoid a low calorie diet or fasting?
The Fast 800 programme is not recommended for the following:
- People who are underweight and/or experiencing an eating disorder, or have a history or suspicion of an eating disorder
- Children (under 18 years old)
- Type 1 diabetics
- Pregnant women, breastfeeding mothers or anyone undergoing fertility treatment
- People who have a significant psychiatric disorder or substance abuse
- People who are under active investigation or treatment, or have a significant medical condition affecting ability to comply with diet
- People who have had a recent cardiac event, myocardial infarction or cerebrovascular accident (<3 months previously) or other heart abnormalities
- People who have had uncontrolled heart disease, uncontrolled hypertension, or kidney failure
- People who are feeling unwell, have a fever, are frail or recovering from significant surgery (<6 months ago)
- People who are on insulin. This is to avoid a potentially dangerous drop in blood sugar (hypo)
- People who are on ‘flozin’ medication (known as SGLT2 inhibitors, taken to reduce blood sugars). This is to avoid the rare complication and potentially dangerous condition called euglycaemic diabetic ketoacidosis (DKA), where despite having normal or only mildly raised ketones the medication can mask a serious complication of diabetes requiring urgent attention
Please read our medical disclaimer for additional information.
How much weight will I lose?
The DIAMOND Study performed by Oxford University and Dr Clare Bailey Mosley (GP and wife of Dr Michael Mosley) looked at the feasibility of using an 800 calorie, low-carb, med-style fasting 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.
Can I re-start the 12-week Programme after I start?
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.
What is the Intermittent Fasting Diet?
The intermittent fasting diet is a flexible eating approach where individuals alternate between periods of eating and fasting. Science has shown that a diet plan for intermittent fasting is effective for weight loss, as well as a number of other health benefits.
How can I get into intermittent fasting in the UK?
At The Fast 800, we’re all about introducing you to the science and benefits of intermittent fasting in the UK. This is a sustainable approach to eating, designed to fit within your day-to-day life to improve your health.
Intermittent fasting is backed by plenty of research and success stories, and has been shown to support weight loss and enhance overall wellness. The Fast 800 will guide you through the intermittent fasting approach best suited to your goals and circumstances. For our community of members, it’s much more than a weight loss tool; it provides structure for long-term health improvement and maintenance.
What are the game-changing effects of an intermittent fasting programme?
Ask anyone following an intermittent fasting diet, and they’ll tell you it’s a complete game-changer. Aside from the weight-shedding benefits, the intermittent fasting lifestyle can impact your life in many unexpected, positive ways. It can help you:
- Gain control over your hunger cues.
- Improve your relationship with food.
- Develop a deeper understanding of your body’s needs.
It’s not just about the numbers on the scale; it’s about enhancing your overall wellbeing and vitality.
How can The Fast 800 help me start intermittent fasting?
If you’re starting this journey for the very first time, you may find yourself seeking a diet plan for intermittent fasting or a comprehensive intermittent fasting programme. That’s where The Fast 800 comes in!
Our intermittent fasting programme is designed to provide accessible, well-structured strategies to empower you to successfully navigate intermittent fasting in the UK.
Is an intermittent fasting programme right for me?
An intermittent fasting programme is the perfect gateway to a more balanced you. But it’s important to remember that everyone’s journey is personal and unique. That’s why our programme tailors the intermittent fasting diet to suit your specific goals, lifestyle, and needs.
This ensures that your journey toward better health and weight loss is not just effective but also sustainable.
How quickly can I expect to see results?
Everyone is different, and weight loss progress varies for each member of our community. However, many of our members report seeing a significant difference in their weight, health, and general wellbeing within a few weeks of starting the programme.
How will intermittent fasting impact my daily routine?
Intermittent fasting is flexible and can easily fit into your lifestyle. The Fast 800 programme provides a number of intermittent fasting strategies, so there is bound to be an approach that you can easily implement into your existing routine.
Can I exercise during an intermittent fasting diet?
Yes, it’s a great idea to integrate exercise into your fasting programme; physical activity is an important contributor to both physical and mental health. What’s great is that our fasting programme includes a range of exercise recommendations designed to fit various fitness levels (from low impact, chair-based to advanced) and lifestyle needs.
What’s included in the diet plan for intermittent fasting?
A diet plan for intermittent fasting includes tailored meal plans based on your preferences and goals, along with other tools to help you successfully navigate intermittent fasting. These entail delicious recipes, nutritional information, behavioural change strategies, physical activity recommendations and access to our lively community.
What support will I receive?
Our entire team, from nutritionists to fitness experts, is ready to guide you on your weight loss journey. Plus, through your membership, you will have ongoing access to our empowering resources and supportive community.
What resources and support does The Fast 800 offer?
Familiarise yourself with our extensive resources, try new recipes from a wide range of cuisines, browse our support products, and read through inspiring success stories from members of our community. With The Fast 800, you are part of a network of like-minded individuals across Australia, all sharing a collective intermittent fasting journey.
What kind of support does The Fast 800 provide?
We strongly believe in the power of community. As part of The Fast 800, you will always have our team ready to guide you, answer your queries, and help you overcome any challenges. Our online community of members offers a plethora of shared experiences and is also invaluable in maintaining your motivation.
What happens after I achieve my weight loss goal?
At The Fast 800 AU, we’re not just about helping you reach your weight loss target. We want to give you the knowledge and habits to maintain a healthier lifestyle for the long term. We’re here to support your journey, even after you’ve hit your goal.
Is The Fast 800 more than just a diet?
Your custom intermittent fasting diet is designed to help you shed excess weight while inspiring a love for eating healthily and mindfully. The Fast 800 empowers you with the tools and knowledge you need to maintain healthy food and movement habits for life.
How does The Fast 800 approach fitness and health?
At The Fast 800, everything we do is based on solid research and advice from trusted health experts. We give you simple tools to not only lose weight but to get healthier and feel great in your everyday life.
Is the fitness approach with The Fast 800 easy to follow?
Achieving and maintaining your fitness and weight loss goals can be hassle-free with our diet plan for intermittent fasting. Forget about complex calculations and time-consuming planning – say hello to a straightforward, guided approach that’s a perfect fit for your busy life.
Why should I join The Fast 800 community?
Join us in a groundbreaking approach to weight loss and wellness where your health transformation is within your grasp! With The Fast 800, we combine scientific research with a supportive community to offer an intermittent fasting programme that’s changing lives.
How does The Fast 800 ensure sustainable weight loss?
Looking for impactful, sustainable weight loss results? The Fast 800 is a scientifically-sound approach to the weight loss experience, combining expert guidance, evidence-based principles, and an encouraging community, ensuring you’re supported on your wellness journey.
What makes The Fast 800 shakes a game-changer?
Life can be hectic, and on days when you’re pushed for time, maintaining a balanced, calorie-controlled diet can be a challenge. That’s where our shakes help – they’re a time-saving solution to ensure you never compromise on nutritional value. Our weight loss shakes are filled with natural ingredients, with nutritional profiles that contribute to a healthy lifestyle and help bolster and sustain weight loss.
How easy are The Fast 800 shakes to use?
Ready in an easy 30 seconds with no cooking required, our shakes offer a simple, no-fuss alternative for meals when you’re on the go. They’re just 200 calories per meal to provide careful portion control, which helps prevent overeating – a common speed bump on the road to weight loss.
How can I start my journey with The Fast 800?
If you’re ready to kick-start your wellness journey with our expert intermittent fasting programme, sign up to The Fast 800 today and tap into the potential of the intermittent fasting diet. Discover a healthier, revitalised version of you today.