
Dr Michael Mosley is a well-known TV and podcast presenter, famous for his simple and accessible health tips. He is a qualified doctor, although he did not remain registered as one. He is best known for his work in promoting intermittent fasting and low-carb diets, such as the 5:2 diet and the Fast 800. He has published several books on these topics, including The Fast Diet, The Fast800 Diet, and The Clever Gut Diet. He has also presented several documentaries, including Trust Me I'm a Doctor, Lose a Stone in 21 Days, and Blood and Guts. His work has attracted attention for its methods and scientific accuracy, with some critics arguing that his advice is dangerous.
| Characteristics | Values |
|---|---|
| Diet Name | The Fast 800 |
| Calorie Intake | 800 calories a day |
| Meal Plan | Two fasting days with 800 calories and five days with sensible portions of moderately low-carb Mediterranean-style food |
| Diet Type | Low-carbohydrate, Mediterranean-style |
| Weight Loss | Average weight loss of 9.5kg in 8 weeks |
| Health Benefits | Drop in blood sugars, blood pressure and medication use |
| Intermittent Fasting | Yes |
| Scientific Accuracy | 58% accuracy according to Red Pen Reviews |
| Other Benefits | Improved metabolic health, reduced risk of chronic illness, improved gut microbiome |
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What You'll Learn

Intermittent fasting
Dr. Michael Mosley is a pioneer of intermittent fasting, having co-founded The Fast 800 with Dr. Clare Bailey in 2018. The programme is based on years of scientific research and has helped tens of thousands of people lose weight and improve their health.
The Fast 800 offers a flexible approach to weight loss and health management, with three different methods that can be adapted depending on individual goals and health journeys. The programme is guided, meaning users cannot pause or restart the course, but they can view content from previous weeks.
The intermittent fasting diet involves alternating between periods of eating and fasting. One approach is the 5:2 diet, where individuals eat normally for five days and consume much less on the other two days. On the two fasting days, individuals are allowed around 800 calories, with a light breakfast and dinner and plenty of water and herbal tea in between. This approach is not about following a particular food pattern but rather focuses on calorie content.
Dr. Mosley also advocated for a Mediterranean-style diet, which is rich in whole grains, olive oil, oily fish, full-fat yoghurt, vegetables, and legumes. This diet is high in fibre, healthy fats, and quality protein, providing all the nutrients needed to combat disease and obesity. He recommended eating at least 60g of protein per day to help individuals feel satiated for longer and improve overall health.
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Low-carb Mediterranean diet
Dr. Michael Mosley is a pioneer of intermittent fasting and a low-carbohydrate diet advocate. He co-founded The Fast 800, a diet plan that combines a ketogenic diet with intermittent fasting. The diet involves consuming 800 calories a day twice a week (called "fasting days") and sensible portions of moderately low-carb, Mediterranean-style food for the remaining five days.
The Low-carb Mediterranean diet is a modification of the traditional Mediterranean diet, which is typically high in carbohydrates and fat and lower in protein, with an emphasis on fruits, vegetables, whole grains, legumes, nuts, beans, olive oil, yogurt, and fish. The low-carb version of this diet recommends reducing the intake of fruits (except for berries), grains, and beans, while increasing the consumption of vegetables, fish, chicken, meat, and eggs. It eliminates processed foods and focuses on healthy fats and lean sources of protein.
The Low-carb Mediterranean diet is particularly beneficial for those with Type 2 diabetes or those at risk of developing it. It has been shown to aid in weight loss, improve heart health, and reduce blood pressure and triglyceride levels. The diet is generally well-tolerated and has been found to be easier to follow than more restrictive low-carb diets like the ketogenic diet.
The Mediterranean diet, whether traditional or low-carb, has been praised as one of the healthiest diets in the world. It is associated with numerous health benefits and has been shown to be effective in controlling blood glucose levels and promoting overall health.
Dr. Mosley's diet plan, The Fast 800, is based on years of research and has helped tens of thousands of people achieve their health and weight loss goals. It offers flexibility, with three different approaches to weight loss and health management, allowing individuals to choose the best path for their specific needs and goals.
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Calorie restriction
Dr Michael Mosley is a pioneer of intermittent fasting. He co-founded The Fast 800 in 2018 with Dr Clare Bailey Mosley, a programme based on years of scientific research. The programme offers a long-term, sustainable approach to calorie restriction, with a focus on an 800-calorie daily eating plan.
The Fast 800 has three different approaches to weight loss and health management, which can be tailored to an individual's health journey and goals. The programme is flexible, allowing users to move between approaches. The diet plan combines a ketogenic diet with intermittent fasting, advocating for a low-carbohydrate Mediterranean diet.
The Mediterranean diet is rich in whole grains, olive oil, oily fish, full-fat yoghurt, vegetables and legumes. It focuses on fibre, healthy fats and quality protein, providing the body with the nutrients it needs to combat disease and obesity. Dr Mosley recommends eating at least 60g of protein a day to help people feel fuller for longer, as well as improving energy and focus.
The programme also includes 'fasting days', with individuals consuming about 800 calories twice a week. The remaining five days of the week involve sensible portions of moderately low-carb Mediterranean-style meals.
Dr Mosley also popularised the 5:2 diet, which involves eating normally on five days of the week and restricting calories on the other two days. This diet does not follow a particular food pattern but focuses on calorie content.
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Health benefits
Dr Michael Mosley is a pioneer of intermittent fasting and is known for his popular Fast 800 Diet. The diet is based on years of research and has helped tens of thousands of people achieve their health goals. The diet plan is flexible and can be adapted depending on individual health journeys and goals.
The Fast 800 Diet recommends an 800-calorie-a-day meal plan that is low in carbohydrates and includes Mediterranean foods. The Mediterranean diet is rich in whole grains, olive oil, oily fish, full-fat yoghurt, vegetables, and legumes. It focuses on fibre, healthy fats, and quality protein, providing all the nutrients needed to combat disease and obesity.
Dr Mosley also recommends eating at least 60g of protein daily, as this helps lower the risk of osteoporosis and cardiovascular disease, speeds up injury recovery, lowers blood pressure, and assists with healthy weight loss. He also emphasizes the importance of fibre for a healthy digestive system.
In addition to the Fast 800 Diet, Dr Mosley has also popularised the 5:2 diet, which involves eating normally five days a week and fasting or eating much less on the other two days. This form of intermittent fasting helps with weight loss and improving health.
Dr Mosley's diets have been praised for their scientific accuracy and effectiveness in improving health and managing weight.
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Weight loss
Dr Michael Mosley is a pioneer of intermittent fasting and low-carbohydrate diets. He is best known for his 5:2 diet, which involves eating normally for five days a week and fasting for the remaining two. The idea is that you focus on calorie content on fasting days, aiming to eat fewer than 600 calories. This can be achieved by having a light breakfast and dinner, with plenty of water and herbal tea in between.
In 2018, Mosley co-founded The Fast 800, a diet plan that recommends an 800-calorie-a-day meal plan that is low in carbohydrates and includes Mediterranean foods. This is a more long-term approach, with one to two "fasting days" per week, and sensible portions of moderately low-carb Mediterranean-style food for the remaining five days. The Mediterranean diet is rich in whole grains, olive oil, oily fish, full-fat yoghurt, vegetables and legumes, providing all the nutrients your body needs to combat disease and obesity.
The Fast 800 has been criticised for promoting an 800-calorie diet, which some medical experts consider dangerous. However, it is a misconception that it is a strict, long-term regime. The programme offers three different approaches to weight loss and health management, which can be followed flexibly depending on your health journey and goals.
Dr Mosley also offers other simple health tips, such as exercising in the cold, turning down the heating at home, and "exercise snacking" – doing a few minutes of physical activity whenever possible, rather than scheduling a long gym session.
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Frequently asked questions
Dr. Michael Mosley is a pioneer of intermittent fasting and a low-carbohydrate diet advocate. He is known for popularising the 5:2 diet and The Fast 800 diet. The Fast 800 diet recommends an 800-calorie-a-day meal plan that is low in carbohydrates and includes Mediterranean foods.
The 5:2 diet involves eating normally on five days a week and fasting or eating much less than usual on the other two days. The focus is on calorie content rather than a particular food pattern.
The Fast 800 diet is a flexible programme with three different approaches to weight loss and health management. It combines intermittent fasting with a low-carb Mediterranean diet, following an 800-calorie daily eating plan.
Dr. Michael Mosley recommends eating at least 60g of protein a day and including plenty of fibre in your diet. He also suggests that extending your fasting window further into the day can increase weight loss and improve metabolic health. Additionally, Dr. Mosley has shared tips on the benefits of cold temperatures for health and wellbeing, such as taking cold showers and exercising in the cold. He has also recommended time-restricted eating, such as staying away from food for 12 hours a day.











































