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
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Exclusive community access
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
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.
I was on two separate medications and by the end of the 12 weeks, I had dropped down to one.
The programme flexibility is the main reason for our success - we've lost 51kg between us.
Losing 63kg has completely turned my health around—I've put my pre-diabetes into remission.
Chris and Lindsay's life-changing lifestyle
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Aches and pains disappeared
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Eczema cleared
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Enjoying exercise
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Full of energy
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Lost 38kg together
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.
As seen in
Our story
The Fast 800 was developed by Dr Michael Mosley and a team of doctors and weight loss experts. Our programme, and range of health support products, including meal replacement shakes, help people lose weight, stay healthy and live longer.
Dr Mosley was committed to using scientific evidence to help people lose weight for better health – not just a “better” body. This foundation means The Fast 800 is rooted in methods that enable long-term weight loss and better health outcomes.
We have proudly supported tens of thousands of people achieve just that, and will continue to honour Dr Mosley’s legacy to help more people into the future.
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 December
How much does the programme cost?
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:
- All offers are ONLY available through website signups
- 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.
It 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
- 800+ 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 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 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.
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.