
The 800-calorie diet is an intensive approach to weight loss, designed for those who want to kick-start significant weight loss and reset their metabolism. It is a very low-calorie diet (VLCD) that can lead to rapid weight loss, but it may not be suitable or safe for everyone. The diet is flexible and follows the principles of a moderately low-carb, Mediterranean-style diet.
| Characteristics | Values |
|---|---|
| Purpose | Kick-start significant weight loss, reset metabolism, and maintain long-term weight loss |
| Diet type | Mediterranean-style, moderately low-carb, with lean protein sources and vegetables |
| Calories | 800 per day |
| Results | Typical weight loss of more than 10kg sustained over 12 months |
| Flexibility | Can switch between approaches as needs change |
| Meal plan | No rigid meal plan, but optional meal replacement shakes (no more than 2 per day or 10 per week) |
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What You'll Learn

Weight loss
The 800-calorie diet is an intensive approach to weight loss. It is not suitable for everyone and it is recommended that you consult a healthcare professional before starting this diet. The 800-calorie diet is designed for those who want to kick-start significant weight loss and reset their metabolism. It is a rapid weight loss plan, with typical weight loss of more than 10kg sustained over 12 months.
The Fast 800 is a flexible, Mediterranean-style diet that can be adapted to suit your needs. Some people start with The Very Fast 800 (the 800-calorie diet) if they have a significant amount of weight to lose or to kick-start weight loss. Others start with The New 5:2 or The Way of Life for gradual weight loss or to improve their overall health.
The 800-calorie diet is a very low-calorie diet (VLCD) and, as such, can lead to rapid weight loss. However, it may not be suitable or safe for everyone and is not routinely recommended. Typically, these sorts of diets are only followed if you have an obesity-related complication that would benefit from rapid weight loss. The NHS advises that, for most people wanting to lose weight in a safe and sustainable way, calorie intake should be reduced to 1,900 calories for men and 1,400 calories for women.
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Gradual weight loss
The 800-calorie diet is an intensive approach to weight loss, which is not suitable for everyone. It is a very low-calorie diet (VLCD) that can lead to rapid weight loss. However, it is not routinely recommended and is typically only followed by those with obesity-related complications.
The Fast 800 is a flexible approach to the 800-calorie diet, which follows the principles of a moderately low-carb, Mediterranean-style diet. It is designed to complement your life and any events, holidays or challenges that come with it. The approach is flexible, and you can switch between different approaches as your needs change. For example, some people start with The Very Fast 800 (the 800-calorie diet) if they have a significant amount of weight to lose or to kickstart weight loss. Others start with The New 5:2 or The Way of Life for gradual weight loss or to improve their overall health.
The Way of Life approach is a long-term maintenance approach using Mediterranean-style recipes, ideal for weight management and improving metabolic health. It involves regular intermittent fasting for an effective, gradual way to lose weight and keep it off long-term. This approach is based on the idea that our bodies use two different types of fuel to function: glucose and fat.
While the 800-calorie diet can lead to rapid weight loss, it is important to note that major studies have shown that following a gradual weight loss plan can be more effective in the long term. A gradual weight loss plan allows you to develop healthy habits and make long-lasting changes to your diet and lifestyle. It also gives your body time to adjust to the changes and reduces the risk of health complications.
If you are considering the 800-calorie diet or any other weight loss plan, it is important to speak to your healthcare professional first to ensure it is safe and suitable for you.
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Long-term weight maintenance
The 800-calorie diet is an intensive approach to weight loss, designed for those who want to kick-start significant weight loss and re-set their metabolism. It is a rapid weight loss plan, with typical weight loss of more than 10kg sustained over 12 months. The diet is flexible, following the principles of a moderately low-carb, Mediterranean-style diet.
The 800-calorie diet is not suitable for everyone and is not routinely recommended. It is typically only followed by those with obesity-related complications who would benefit from rapid weight loss.
For long-term weight maintenance, the diet can be adapted to follow The New 5:2 or The Way of Life approaches, which are gradual weight loss plans or are designed to improve overall health. These plans are based on regular intermittent fasting and Mediterranean-style recipes, which are ideal for weight management and improving metabolic health.
The key to long-term weight maintenance is finding an approach that works for you and is sustainable in the long term. This may involve switching between different approaches as your needs change. It is important to remember that, as with any diet, you should speak to your healthcare professional before starting.
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Mediterranean-style recipes
The 800 calorie diet is an intensive approach to weight loss, not suited to everybody. It is a rapid weight loss plan, with typical weight loss of more than 10kg sustained over 12 months. The diet is flexible and follows the principles of a moderately low-carb, Mediterranean-style diet.
- Grilled chicken fillets with an authentic salad of Kalamata olives, feta cheese, tomato and mint
- Mediterranean-style lamb chops served on a bed of hummus, roasted tomatoes, olives and feta
- Fish in tomato sauce, topped with herby breadcrumbs
- Chargrilled vegetables with red pesto, basil and cheese
- Spanish-style frittatas, or 'tortilla', served with oozing cheese and a crunchy salad
- Slow-cooked basmati rice pot with deep paprika flavours
- Bruschetta with beans and salty Greek cheese
- Greek-style sandwiches, or gyros, with ground beef
- Tabbouleh with cooked grains, mozzarella, pesto, tomatoes, spinach and basil, topped with grilled shrimp or salmon
- Falafel with tahini sauce
- Shrimp Scampi
- Shakshuka: a classic Mediterranean dish that combines simmering tomatoes, onions, spices and poached eggs
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Intermittent fasting
An 800-calorie diet is an intensive approach to weight loss, not suited to everybody. It is a rapid weight loss plan, with typical weight loss of more than 10kg sustained over 12 months. It is designed for those who want to kick-start significant weight loss and reset their metabolism. It is not recommended for everyone and is not routinely advised.
The 800-calorie diet is one of three approaches to The Fast 800, a flexible, Mediterranean-style diet. The other two approaches are The New 5:2 and The Way of Life, which are recommended for gradual weight loss or to improve overall health. The Fast 800 is designed to complement your life and any event, holiday or challenge that comes with it.
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Frequently asked questions
The 800 calorie diet is a rapid weight loss plan, designed for those who have a significant amount of weight to lose.
The 800 calorie diet is an intensive approach to weight loss, which involves eating 800 calories or less per day.
The 800 calorie diet is designed to help people lose weight fast. Major studies have shown that following an 800 calorie a day diet is much more effective than going "slow and steady". People on the 800 calorie diet typically lose more than 10kg over 12 months.
The 800 calorie diet is an intensive approach to weight loss and may not be suitable for everyone. As with any diet, you should speak to your healthcare professional before starting.
The 800 calorie diet is a moderately low-carb, Mediterranean-style diet.











































