
The Fast 800 is a diet and lifestyle plan developed by Dr. Michael Mosley, co-founder of The Fast 800 Online Programme. It is based on intermittent fasting and a Mediterranean-style diet, with optional meal replacement shakes. The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which an 800-calorie daily diet is followed. This involves eating a moderately low-carb Mediterranean-style diet, with lean protein sources and vegetables. The diet is flexible and can be tailored to weight loss or general health goals.
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What You'll Learn
- The Fast 800 is a combination of intermittent fasting and a Mediterranean-style eating plan
- The diet is flexible and can be tailored to weight loss or general health
- The diet is backed by science and designed for real results
- The diet is safe and can be followed for up to 12 weeks or until a healthy BMI is achieved
- The diet can help improve metabolic health, reduce the risk of chronic illness and promote better gut health

The Fast 800 is a combination of intermittent fasting and a Mediterranean-style eating plan
The Fast 800 is a diet plan developed by Dr. Michael Mosley, co-founder of The Fast 800 Online Programme. It is a combination of intermittent fasting and a Mediterranean-style eating plan. The diet is designed to be flexible and tailored to individual weight loss goals and general health.
The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which you follow an 800-calorie daily eating plan. This involves consuming a moderately low-carb Mediterranean-style diet, with lean protein sources and vegetables. The Mediterranean-style diet promotes a daily diet of fresh vegetables, quality protein, and healthy fats, including anti-inflammatory foods that help keep blood sugar levels stable and leave you feeling full and satisfied.
The Fast 800 diet also includes optional meal replacement shakes, which are high in protein, fibre, and healthy fats. These shakes are recommended on days when cooking is not possible, with an emphasis on whole, natural foods over shakes. The diet is designed to be flexible, allowing individuals to switch between approaches as their needs change.
The Mediterranean-style diet recommended by The Fast 800 involves eating a large amount of fresh fruit and vegetables, a variety of whole grains, and a moderate amount of fish. Healthy fats such as olive oil, nuts, and seeds are also encouraged. During this stage, processed foods are reduced or avoided, and sugar and starchy carbs like white bread and white pasta are limited.
The Fast 800 diet is based on scientific evidence and aims to empower individuals with the tools and knowledge to live a healthy lifestyle long-term.
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The diet is flexible and can be tailored to weight loss or general health
The Fast 800 diet is a flexible and sustainable diet plan that can be tailored to weight loss or general health. It is based on intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which you follow an 800-calorie daily eating plan.
The diet has three different approaches to weight loss and health management, which you can move between flexibly depending on your health journey and goals. The three approaches are The Very Fast 800, The New 5:2, and The Way of Life. The Very Fast 800 is an 800-calorie diet for those who have a significant amount of weight to lose or want to kickstart weight loss. The New 5:2 and The Way of Life are for gradual weight loss or to improve overall health.
The diet is based on the principles of a moderately low-carb, Mediterranean-style diet. This involves eating a large amount of fresh fruit and vegetables, a variety of whole grains, and a moderate amount of fish. Healthy fats such as olive oil, nuts, and seeds are also encouraged. The diet also includes a weekly fast day, if needed. The aim of this stage is to normalise liver and pancreas fat and promote regular insulin response and blood glucose management.
The Fast 800 Online Programme provides tools and knowledge to achieve your goals, no matter which approach you are following. It includes weekly exercise plans with guided videos for high-intensity interval training (HIIT), resistance and stretching, ranging from low-impact to advanced levels. It also includes weekly mindfulness content and meditations to manage stress and promote wellbeing.
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The diet is backed by science and designed for real results
The Fast 800 diet is backed by science and designed for real results. It is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which you follow an 800-calorie daily eating plan. This phase involves eating a moderately low-carb Mediterranean-style diet, which is rich in protein, fibre, and healthy fats. The diet is flexible and can be tailored to your personal goals and lifestyle. For instance, you can choose to follow The Very Fast 800 (an 800-calorie diet) if you have a significant amount of weight to lose, or The New 5:2 or The Way of Life for gradual weight loss or to improve your overall health.
The Mediterranean-style diet promotes a daily diet of fresh vegetables, quality protein, and healthy fats, including anti-inflammatory foods that help keep your blood sugar levels stable and leave you feeling full and satisfied. The diet is designed to be safe and effective, with major studies showing that following an 800-calorie-a-day diet is more effective than slower approaches. The diet also claims to reduce your risk of type 2 diabetes, heart disease, and cancer. For those with type 2 diabetes, the very low-calorie diet in stage one may put your condition into remission.
The Fast 800 diet is based on years of research by Dr. Michael Mosley, who co-founded The Fast 800 Online Programme in 2018. The programme provides tools and knowledge to help you achieve your goals, with educational content, videos, guided meditations, and a comprehensive exercise plan. The programme also includes weekly exercise plans for high-intensity interval training (HIIT), resistance, and stretching, as well as exclusive articles, learning content, and access to professionally qualified health coaches. The diet's flexibility allows you to switch between approaches as your needs change, making it a sustainable lifestyle choice.
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The diet is safe and can be followed for up to 12 weeks or until a healthy BMI is achieved
The Fast 800 diet is a safe and effective approach to weight loss and can be followed for up to 12 weeks or until a healthy BMI is achieved. It is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The plan starts with a rapid weight loss phase, during which you follow an 800-calorie diet every day for a minimum of two weeks, up to a maximum of 12 weeks. This initial stage is designed to switch the body into a mild ketosis.
The Mediterranean-style diet promotes a daily diet of fresh vegetables, quality protein and healthy fats, including anti-inflammatory foods that help keep blood sugar levels stable and leave you feeling full and satisfied. The diet is moderately low in carbohydrates and limited in starchy carbs and sugar. It includes lean protein sources and encourages the consumption of healthy fats such as olive oil, nuts and seeds. The Fast 800 diet is flexible and can be tailored to individual needs and goals, with three different approaches to weight loss and health management. It is designed to complement your life and any events, holidays or challenges that come with it.
The online programme provides tools and knowledge to help you achieve your goals, with educational content, videos, guided meditations and a comprehensive exercise plan. The programme includes weekly exercise plans for high-intensity interval training (HIIT), resistance and stretching, ranging from low-impact to advanced levels. It also offers exclusive articles, learning content and access to professionally-qualified health coaches. The Fast 800 community provides a social media-style platform for members to share their experiences and support each other.
The diet is backed by scientific research and developed by Dr Michael Mosley, who co-founded The Fast 800 Online Programme in 2018. The programme has transformed the lives of tens of thousands of people worldwide and continues to grow in popularity. The diet is praised for its flexibility and effectiveness in promoting weight loss and improving health. It is designed to be an easy-to-follow programme that empowers individuals to make healthier choices and achieve long-term health and weight loss goals.
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The diet can help improve metabolic health, reduce the risk of chronic illness and promote better gut health
The Fast 800 diet is a combination of intermittent fasting and a Mediterranean-style eating plan. It is a flexible and sustainable diet plan that can be tailored to weight loss or general health goals. The diet is designed to be safe and effective, with three different approaches to weight loss and health management. The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which a daily 800-calorie eating plan is followed. This phase involves eating a moderately low-carb Mediterranean-style diet, which is rich in protein, fibre, and healthy fats.
The diet can help improve metabolic health by resetting the metabolism and triggering desirable metabolic changes. The Mediterranean-style diet, which is a key component of the Fast 800 approach, is known for its anti-inflammatory properties and its ability to help maintain stable blood sugar levels. By keeping blood sugar levels stable, the diet can help reduce the risk of chronic illnesses such as type 2 diabetes, heart disease, and cancer.
The Mediterranean diet is also associated with improved gut health. It emphasizes the consumption of fresh fruits and vegetables, whole grains, lean protein sources, and healthy fats like olive oil, nuts, and seeds. This diet is naturally low in processed foods and encourages home-cooked meals, which can promote a healthier gut microbiome. Additionally, the Mediterranean diet is often accompanied by a weekly fast day, which can give the gut a break from constant digestion and allow it to focus on healing and regeneration.
The Fast 800 diet's flexibility allows individuals to find an approach that works best for them and can be easily integrated into their lifestyle. This flexibility, combined with the diet's focus on whole, natural foods, makes it a sustainable approach to improving metabolic health, reducing the risk of chronic illness, and promoting better gut health. The diet's effectiveness in weight loss can also help reduce the risk of chronic illnesses associated with obesity.
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Frequently asked questions
The Fast 800 is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The plan starts with a rapid weight loss phase that lasts between two and 12 weeks, during which you follow an 800-calorie daily eating plan.
The rapid weight loss phase involves eating 800 calories a day. The key to feeling satiated, while restricting calories, is to consume a moderately low-carb Mediterranean-style diet, rich in protein, fibre and healthy fats.
The aim of the diet is to normalise liver and pancreas fat and promote regular insulin response and blood glucose management. It is also claimed to reduce your risk of type 2 diabetes, heart disease and cancer.
The diet is aimed at those wishing to lose weight, especially those with excess abdominal fat, as well as those with blood sugar issues, including pre-diabetes and type 2 diabetes.







































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