- Long-term weight loss with better health outcomes
- Achievable and effective diet, exercise and lifestyle habits

Michael's passion
“My husband, Michael, was passionate about helping people improve their health through simple, everyday habits. Together, we co-founded The Fast 800 in 2018 to make scientifically-backed weight loss and health strategies more accessible. For Michael, it was always about long-term health improvements. I’m proud The Fast 800 continues to honour his legacy and mission of helping people achieve better health through the latest science.”
Dr Clare Bailey Mosley
How to lose weight for better health according to Dr Mosley
After developing type 2 diabetes, which claimed his father’s life, Dr Mosley became a ‘human guinea pig’ to explore diet and lifestyle interventions. By adopting scientifically-backed methods, including a Mediterranean-style diet, calorie restriction, and intermittent fasting, he put his diabetes into remission. This success led to the creation of The Fast 800, co-founded with his wife, Clare, and a team of health experts.

Mediterranean-style food
“Scientific evidence shows a Mediterranean-style diet supports long-term weight loss, better blood sugar management, and lowers the risk of heart disease, type 2 diabetes, and other chronic conditions.” – Dr Mosley
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Scientifically praised as world’s best diet
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Low-carb, rich in fibre and protein
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Promotes fat burning and weight loss
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All cuisines are able to fit into a “Med-style diet”
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Reduces risks of chronic disease

Calorie restriction, as required
“Research originally focused on 500-600 calories for rapid weight loss, but 800 calories proved more effective and sustainable in recent studies—how The Fast 800 was developed.” – Dr Mosley
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Achievable for most
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Enables 2 or 3 meals a day
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Scientifically found to result in weight loss
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Can be followed daily for up to 12 weeks
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Can be followed 2-3 days per week long term

Intermittent fasting
“Intermittent fasting broadly means giving your body a break from constant eating. Numerous studies show it is a safe, effective way to lose weight, maintain it, and control blood sugar.” – Dr Mosley
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Flexible approaches to suit you
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Can improve sleep and mental health
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Scientifically found to result in weight loss
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Simple change that can have a big impact
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Improves metabolic health long-term alongside Mediterranean-style diet
Keep up with Dr Michael Mosley’s methods. Join our free newsletter
The Fast 800 makes Dr Mosley’s findings actionable and accessible. To keep up to date with weight loss and health tips, recipes, news and offers, we invite you to sign up to our free newsletter. You'll also receive our Intermittent Fasting Guide as a bonus resource to help you on your way to better health.
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We've helped over 120,000 people just like you lose weight, keep it off and improve their health

We loved the meals and didn’t miss carbs as much as we thought we would. We felt full after all!

I find that I now crave exercise and healthy food, something I wouldn’t have ever thought I’d hear myself saying.

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

I stuck to 800 cals/ day and lost weight almost immediately, my sleep improved and the hot flushes decreased so much.
Frequently Asked Questions
How can I find out more about the 12-week Programme?
Learn more about The Fast 800 12-week 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 can I learn more about intermittent fasting?
Learn more about The New 5:2.