
The Fast 800 diet is a weight-loss plan that combines intermittent fasting with a Mediterranean-style eating plan. On days when cooking is not possible, the diet recommends meal replacement shakes that are high in protein, fibre, and healthy fats. While the plan emphasizes whole, natural foods, it allows for up to two shakes per day or ten per week. The diet starts with a rapid weight-loss phase, typically lasting between two and twelve weeks, where individuals follow an 800-calorie daily eating plan. This phase is suitable for those with a lot of weight to lose, a need for quick results, or type 2 diabetes.
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What You'll Learn

Meal replacement shakes
The Fast 800 diet 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 Fast 800 meal replacement shakes are formulated to reflect a Mediterranean diet, being nutrient-dense, lower in carbs, and higher in fats and protein to keep you fuller for longer. The shakes are high in fibre, which is key to good gut health, and contain 26 vitamins and minerals for quick and easy nutrition. They are also 100% natural, with no artificial ingredients.
The shakes are designed to be a convenient and quick way to get your daily dose of nutrients while still embracing the principles of the Mediterranean diet. They are also a great alternative for busy days or when cooking is not possible. The Fast 800 offers a variety of flavours and formulas, including vegan options, so there is something for everyone.
To make a shake, simply add five level scoops (50g) of the formula to 200-300ml of water (adjusting the amount of water to your taste). For a creamier texture, you can add unsweetened almond milk or regular milk. The shakes can be enjoyed as a small meal (200kcal) or as a quick and easy breakfast to keep you full and satisfied throughout the day.
It is important to note that meal replacement shakes should not be your only source of nutrition. The Fast 800 recommends a maximum of two shakes per day or seven to ten per week, with a focus on whole, natural foods for the rest of your meals.
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Intermittent fasting
The Fast 800 diet is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The diet typically starts with a rapid weight-loss phase lasting between two and 12 weeks, during which individuals follow an 800-calorie daily eating plan. This phase is only recommended for those with a lot of weight to lose, a need for rapid results, or a plateau in their weight-loss journey.
During this initial phase, the diet recommends following a moderately low-carb, Mediterranean-style diet, with lean protein sources and vegetables. On days when cooking is not feasible, meal replacement shakes are available, but these should not exceed two shakes per day or ten per week. The emphasis is on whole, natural foods.
The second stage of the plan involves intermittent fasting, restricting calories to 800 a day for two days of the week and then eating a healthy, low-carb, Mediterranean diet for the remaining five days. This phase encourages home cooking, a reduction in processed foods, and a focus on vegetables, wholegrains, nuts, seeds, legumes, healthy fats, and lean protein.
The Fast 800 diet is flexible, and individuals can switch between approaches as their needs change. The Very Fast 800 (the 800-calorie diet) is suitable for those with a significant amount of weight to lose or those looking to kickstart their weight loss journey. The New 5:2 or The Way of Life are gradual weight loss approaches designed to improve overall health.
It is important to note that very low-calorie diets may not be safe or suitable for everyone and are not routinely recommended. Before starting any diet, it is essential to consult a healthcare professional to ensure it can be undertaken without risking your health.
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Mediterranean-style diet
The Fast 800 diet is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The diet 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 is achieved through a moderately low-carb, Mediterranean-style diet, with lean protein sources and vegetables.
The Mediterranean diet is rich in plant-based foods and healthy fats. It involves eating lots of fruits, vegetables, whole grains, and extra virgin olive oil. The diet is also high in protein, fibre, and healthy fats, with an emphasis on whole, natural foods.
There are many Mediterranean-style diet recipes that do not require cooking. A simple Mediterranean salad recipe includes tomatoes, cucumbers, and parsley, with optional additions like feta cheese, chickpeas, or cooked couscous. A Mediterranean-style tuna salad with crunchy vegetables, fresh herbs, and a Dijon vinaigrette can be served on toast or in pita pockets.
For those who prefer a vegetarian diet, the Mediterranean diet can be modified to exclude meat and fish, with protein sourced solely from plant-based options like nuts and beans.
- Put 4 halved and stoned plums in a saucepan.
- Add 2 x 10-12cm orange zest strips, 100ml of fresh orange juice, 150ml of water, and 1/4 tsp of ground cinnamon. Stir gently.
- Bring the liquid to a simmer, cover with a lid, reduce the heat to low, and cook for 10-15 minutes.
- Divide the spiced plums between two bowls, along with 100g of full-fat Greek yogurt and 15g of toasted flaked almonds.
- This dish can be served warm or cold.
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Rapid weight loss
The Fast 800 diet is a combination of intermittent fasting and a Mediterranean-style eating plan, with optional meal replacement shakes. The diet has two stages. The first stage is a rapid weight loss phase that lasts between two and 12 weeks, during which individuals follow an 800-calorie daily eating plan. This stage is only recommended for those who have a lot of weight to lose, need fast results, have hit a plateau, or have type 2 diabetes. On days when cooking is not possible, meal replacement shakes are available. These shakes are high in protein, fibre, and healthy fats, and are designed with the principles of a Mediterranean diet in mind.
The second stage involves restricting calories to 800 a day for two days of the week and eating a healthy, low-carb, Mediterranean diet for the remaining five days. This stage encourages home cooking, the reduction of processed foods, and a focus on vegetables, wholegrains, nuts, seeds, legumes, healthy fats, and lean protein.
The Very Fast 800 is an intensive approach to weight loss and is not suitable for everyone. It is recommended that individuals consult their healthcare provider before starting this diet.
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Calorie restriction
The second stage of the plan involves restricting calories to 800 a day for two days of the week, then eating a healthy, low-carb, Mediterranean diet for the remaining five days. This phase encourages home cooking and the consumption of whole, natural foods, while reducing processed foods. It focuses on vegetables, wholegrains, nuts, seeds, legumes, healthy fats, and lean protein.
The final maintenance phase is designed to fit personal goals and lifestyles. It involves continuing with the Mediterranean-style of eating, following a low-sugar diet with limited starchy carbs, and including a weekly fast day if needed. This phase is intended to help maintain a healthy weight and improve health outcomes.
The Fast 800 diet is flexible, and adherents can switch between approaches as their needs change. The Very Fast 800 (the 800-calorie diet) is an intensive approach for those with a significant amount of weight to lose or to kickstart weight loss. The New 5:2 and The Way of Life are more gradual approaches aimed at improving overall health.
It is important to note that very low-calorie diets may not be suitable or safe for everyone and are not routinely recommended. The NHS advises that, for most people, a safe and sustainable weight loss can be achieved by reducing calorie intake to 1,900 calories for men and 1,400 calories for women. Long-term excessive calorie restriction can lead to nutritional deficiencies and impaired metabolic function, and it is not a sustainable method for weight loss.
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Frequently asked questions
Yes, on days when cooking is not possible, The Fast 800 Shakes provide a convenient alternative. These shakes are high in protein, fibre, and healthy fats, and are designed to fit in with the principles of the Mediterranean diet.
The Mediterranean diet involves eating a lot of fresh fruit and vegetables, whole grains, and a moderate amount of fish. It also encourages the consumption of healthy fats such as olive oil, nuts, and seeds.
The Fast 800 diet involves restricting calorie intake to 800 calories a day during the initial rapid weight loss phase, which lasts between two and 12 weeks. After this, the diet transitions to the 5:2 approach, where 800 calories are consumed on two "fasting days" per week, and a healthy, balanced, Mediterranean-style diet is followed on the other five days.
A recipe that can be followed on the Fast 800 diet involves putting halved and stoned plums in a saucepan with orange zest strips, orange juice, water, and cinnamon. This mixture is then simmered for 10-15 minutes and served with Greek yogurt and toasted flaked almonds.
The Fast 800 diet has been praised as one of the most effective ways to lose weight, and it can also promote better gut health. A study involving nearly 300 overweight type 2 diabetics showed that participants on an 800-calorie diet for 12 weeks experienced significant weight loss and improved blood sugar control.











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