
The Fast 800 is a diet plan developed by Dr Michael Mosley, a pioneer of intermittent fasting. The diet involves eating 800 calories a day for two weeks, followed by an assessment, or 800 calories twice a week (called 'fasting days'). It is a very low-calorie diet based on the principles of the Mediterranean diet, which is recognised by nutrition experts as beneficial for overall health. 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.
| Characteristics | Values |
|---|---|
| Calorie intake | 800 calories a day or twice a week |
| Diet type | Very low-calorie diet |
| Food type | Mediterranean-style, low-carb, high protein |
| Duration | Up to 12 weeks |
| Results | Weight loss, lower blood sugar, reduced blood pressure, improved heart health, reduced inflammation |
| Flexibility | Three different approaches to weight loss and health management |
| Meal plans | Personalised, developed by in-house nutritionists |
| Recipes | 900+, covering a range of global cuisines |
| Workouts | 400+ guided workouts from beginner to advanced |
| Support | Real support from Health Coaches and an interactive Community |
Explore related products
What You'll Learn
- The Fast 800 diet is a flexible, low-calorie eating plan
- It involves intermittent fasting and a Mediterranean-style diet
- The diet can help with rapid weight loss and blood sugar control
- It may reduce the risk of type 2 diabetes, heart disease and cancer
- The diet is not suitable for everyone and should be followed short-term

The Fast 800 diet is a flexible, low-calorie eating plan
The Fast 800 is a flexible, low-calorie eating plan developed by Dr Michael Mosley, who is known for pioneering intermittent fasting. The diet combines intermittent fasting with a Mediterranean-style eating plan, with optional meal replacement shakes. The Mediterranean diet has been recognised by nutrition experts as the best diet for longevity and overall health.
The Fast 800 diet offers three different approaches to weight loss and health management, allowing for flexibility around your lifestyle and goals. The first stage of the plan involves a very low-calorie diet, with 800 calories per day for up to 12 weeks. This stage may result in rapid weight loss and can be challenging to stick to. It is not suitable for everyone and is not designed to be followed long-term. After this initial period, you transition to a longer-term approach, with a more sustainable rate of weight loss.
The Mediterranean-style recipes are moderately low-carb and include healthy fats, fibre, and protein. The diet also includes 400+ guided workouts, from low-impact beginner to advanced fitness levels, with no equipment needed. The Fast 800 also provides access to Health Coaches and an interactive Community of members with similar goals and interests.
The DIAMOND study, performed by Oxford University, examined the effectiveness of an 800-calorie, low-carb, Mediterranean-style fasting diet for people with type 2 diabetes. The study found that after 8 weeks, participants lost an average of 9.5kg, and experienced improvements in blood sugars, blood pressure, and medication use. The Fast 800 diet claims to reduce the risk of type 2 diabetes, heart disease, and cancer. It is aimed at those with excess abdominal fat and blood sugar issues, including pre-diabetes and type 2 diabetes.
Steak and Eggs Diet: Healthy or Hazardous?
You may want to see also
Explore related products
$12.52 $19.99

It involves intermittent fasting and a Mediterranean-style diet
Dr Michael Mosley's diet plan, The Fast 800, involves intermittent fasting and a Mediterranean-style diet. It is a flexible and sustainable diet aimed at people with obesity or type 2 diabetes. It is claimed to be an effective way to lose weight, improve mood, and reduce blood pressure, inflammation, and blood sugars.
The Fast 800 diet is a calorie-restricting eating plan that involves consuming 800 calories a day for 2 weeks straight or 800 calories on 2 days a week for slower weight loss. 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 2 and 12 weeks. During this phase, you follow an 800-calorie eating plan. The Mediterranean-style diet includes healthy fats, lots of vegetables, and good protein, which offers a lot of benefits. It can help regulate blood sugar, lower blood pressure, improve heart health, and aid in weight loss.
The Mediterranean-style recipes are moderately low-carb and are developed by in-house nutritionists. The Fast 800 is a flexible approach where individuals alternate between periods of eating and fasting. The programme also includes time-restricted eating, where you eat within a certain period, for example, fasting for 16 hours and eating during an 8-hour window. The diet plan is claimed to be effective for weight loss and a number of other health benefits.
The Fast 800 diet is based on the latest scientific research and is designed to be an easy-to-follow programme. It is a highly flexible programme that can be tailored to an individual's goals and can be continued indefinitely. The diet is not meant to be followed long-term and is not designed to be a strict, 800-calorie regime. It is a common misconception that Michael Mosley's diet plan is strict and long-term. Instead, it offers three different approaches to weight loss and health management, allowing for flexibility around an individual's lifestyle and goals.
Sirtfood Diet: Foods to Eat and Avoid
You may want to see also
Explore related products

The diet can help with rapid weight loss and blood sugar control
The Fast 800 diet, developed by Dr. Michael Mosley, is a calorie-restrictive diet that involves consuming 800 calories a day for up to 12 weeks. This diet is particularly effective for rapid weight loss, especially for those with obesity-related complications who could benefit from quick weight loss.
The diet is based on the principles of a Mediterranean-style diet, which is recognised by nutrition experts as a healthy and sustainable way of eating. This style of eating includes healthy fats, lots of vegetables, and good sources of protein. The Mediterranean diet has been shown to offer benefits such as regulating blood sugar, lowering blood pressure, and improving heart health.
Combining the Mediterranean diet with an 800-calorie daily intake can lead to accelerated weight loss. This is because 800 calories is considered the minimum intake that is still manageable but low enough to trigger weight loss and desirable metabolic changes. For instance, a study by Oxford University, called the DIAMOND study, found that after 8 weeks, participants following an 800-calorie, low-carb, Mediterranean-style diet lost an average of 9.5kg and experienced a significant drop in blood sugars, blood pressure, and medication use.
The Fast 800 diet is flexible and can be tailored to individual needs and goals. It is important to note that very low-calorie diets may not be suitable or safe for everyone and are not routinely recommended. However, for those who are motivated and seeking rapid weight loss, the Fast 800 diet can be an effective approach when combined with a Mediterranean-style eating plan.
Salty Diet: Friend or Foe to Bronchitis?
You may want to see also
Explore related products

It may reduce the risk of type 2 diabetes, heart disease and cancer
Dr Michael Mosley's Fast 800 diet may reduce the risk of type 2 diabetes, heart disease and cancer. The diet is aimed at people with obesity or type 2 diabetes. It is a very low-calorie diet that involves eating 800 calories a day for up to 12 weeks. The Mediterranean-style diet is rich in healthy fats, vegetables, and protein, and offers a lot of benefits. It can help regulate blood sugar, lower blood pressure, and improve heart health.
The DIAMOND study by Oxford University and Dr Clare Bailey Mosley (GP and wife of the late Dr Michael Mosley) examined the effectiveness of an 800-calorie, low-carb, Mediterranean-style fasting diet for treating type 2 diabetes. The average weight loss after 8 weeks was 9.5kg, and results also showed a significant decrease in blood sugars, blood pressure, and medication use.
The Fast 800 diet is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. It is a flexible and sustainable diet that can be tailored to weight loss or general health. The Mediterranean diet has been recognised by nutrition experts as the best diet for longevity and overall health.
The 800-calorie diet is not suitable for everyone and is not routinely recommended. It is typically followed by those with obesity-related complications who would benefit from rapid weight loss. The NHS advises that most people looking to lose weight in a safe and sustainable way should reduce their calorie intake to 1,900 calories for men and 1,400 calories for women.
Popcorn on the BRAT Diet: A Good Idea?
You may want to see also
Explore related products
$12.99 $24.99

The diet is not suitable for everyone and should be followed short-term
Dr Michael Mosley's Fast 800 diet is a flexible and sustainable diet that can be tailored to weight loss or general health. It is not a strict, 800-calorie, long-term regime. Instead, it offers three different approaches to weight loss and health management, allowing for flexibility around an individual's lifestyle and goals.
The Mediterranean diet is recognised by nutrition experts as the best diet for longevity and overall health. It is rich in healthy fats, vegetables, and protein. However, the Fast 800 diet's very low-calorie approach may not be suitable for everyone. Restricting calories over a long period can limit nutrient and energy intake, especially if following the 'real food' version of the plan.
The diet should be followed short-term, with an option to transition to a longer-term approach after 12 weeks. The short-term nature of the diet is emphasised by the inclusion of meal replacement shakes, which are a tool for short-term use only. The shakes are fortified with vitamins and minerals and can help fulfil nutrient requirements.
While the Fast 800 diet can be an effective way to lose weight and improve health, it is important to recognise that it may not be suitable for everyone and should be followed under the guidance of a healthcare professional.
Medifast Diet: Counting the Calories, Is It Worth It?
You may want to see also
Frequently asked questions
The Fast 800 is a calorie-restricting diet that involves periods of intermittent fasting. It is a combination of a Mediterranean-style diet and intermittent fasting.
The diet involves consuming 800 calories a day for up to 12 weeks, followed by a transition to a longer-term approach. On the remaining five days of the week, individuals can eat sensible portions of moderately low-carb, Mediterranean-style food without needing to count calories.
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. It is also said to reduce the risk of certain conditions such as heart disease and cancer.
The diet is aimed at people with obesity or type 2 diabetes. It is not suitable for everyone and is not recommended for long-term use.
Results may vary for each individual. Some people have reported losing significant weight and keeping it off, as well as reversing blood sugar issues and reducing blood pressure.











































