What is The Fast 800 diet? (2024)

When Dr Michael Mosley unveiled his latest diet, he described it as his “best plan ever”.

The Fast 800 diet, created by the medical journalist based on the very latest scientific findings, picks up from where Mosley’s 5:2 diet (launched back in 2012) left off. It’s a combination of intermittent fasting and the Mediterranean diet (recently voted best in the world and a favourite of our nutritionist), combined with exercise and optional meal replacement shakes.

All-new The Fast 800 plan

There’s a big focus on calorie counting during the rapid weight loss phase with Dr Mosley’s latest diet. He claims that 800 calories is the “magic number when it comes to successful weight loss”. He revealed in the Daily Mail: “The latest scientific findings show the health and weight benefits of intermittent fasting along with a dietary approach that promotes rapid weight loss.” The Fast 800 followers are encouraged to restrict themselves to 800 calories per day for a minimum of two weeks, but can follow this plan for longer. The idea is to tailor the diet to your own needs – you can just do the 5:2 component or you can follow the more intense 800-calories-a-day plan for up to 12 weeks.

How can The Fast 800 diet help you?

Foods that are high in sugar and carbs put us at risk of type 2 diabetes and obesity and can cause spikes in our blood sugar levels. Shortly after eating, these drop rapidly, leaving us hungry for more food. The Fast 800 diet recommends lower-carb, higher-fat meals packed with essential nutrients and protein and fibre that keep you feeling fuller for longer, improve blood sugar levels and help you lose weight.

What does 800 calories look like?

Check out our 800-calorie meal plan to see what you can eat on 800 calories a day. Also, take a look at some of our most popular 500-calorie meals, 250-calorie treats and 100-calorie snacks.

Time Restricted Eating

Followers of The Fast 800 should also aim to have an overnight fast each day, where they go for 12 hours without eating. Mosley calls this “Time Restricted Eating”. For example, you might eat dinner at 7pm but you then should avoid eating until 7am the following morning.

Meal replacement shakes

Mosley admits that The Fast 800 is the first time he’s decided to include meal replacement shakes. These aren’t the old-school shakes people used to buy in the chemist, but homemade drinks and packed with nutritious ingredients. With each shake worth 200 calories, you can fill up quickly, easily (and even on the run) on healthy plant-based fats, vitamins and other essential nutrients. Although they’re not a compulsory part of The Fast 800 plan, Dr Mosley says that they’re great to “keep you feeling full and encourage fat burning”. He insists you mustn’t just rely on shakes for your calories and shouldn’t stay on them for too long.

The 5:2 diet phase

After 14 days on The Fast 800, you’re encouraged to “transition” to a new iteration of his 5:2 diet, aiming for 800 calories per day at least 2 days a week, with a 14-hour fast overnight.

The Fast 800 Online Programme: everything you need to know

The Fast 800 offers a flexible approach to healthy living which includes intermittent fasting methods, depending on your health goals. The Fast 800 rapid weight loss approaches can help individuals who are currently obese or overweight lose weight quickly and maintain a healthy weight, using intermittent fasting practices. However, if you don’t have much weight to lose, we recommend starting on The New 5:2 approach or The Way of Life approach, with TRE alongside for the added benefits.

Following Dr Michael Mosley’s diet plan is easy when you have the right support. The Fast 800 Online Programme provides you with the tools and knowledge to achieve your goals, no matter which approach you are following.

The Fast 800 Online Programme provides daily meal plans for whichever approach is most suited to you, with options for three meals a day, or two meals a day for those wanting to extend their TRE to the 16:8 method. As a member of the programme, you also have access to daily workout videos and Health Coach and community support, as you need it.

Does The Fast 800 diet work?

While he was developing the program, Dr Mosley took several months to gain more than 6kg. After starting the plan, he admits that at times his “energy levels felt lower” during those two weeks, but found the 5:2 phase that followed “surprisingly easy”. He lost almost 5kg in just 2 weeks. He of course recommends that you seek advice from your doctor before embarking on this or any other restrictive diet, as it may not be suitable for everyone.

For more info on The Fast 800 diet, visit the official website.

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*This nutrition information does not constitute or replace professional medical or dietetic advice received by individuals.

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What is The Fast 800 diet? (2024)

FAQs

What is The Fast 800 diet? ›

The Fast 800 diet, created by Dr Michael Mosley

Dr Michael Mosley
Michael Hugh Mosley (22 March 1957 – 5 June 2024) was a British television and radio journalist, producer, presenter and writer who worked for the BBC from 1985 until his death. He presented television programmes on biology and medicine and regularly appeared on The One Show.
https://en.wikipedia.org › wiki › Michael_Mosley
, is the most intensive phase of the Blood Sugar Diet and comes with claims of rapid weight loss and reversal of Type 2 Diabetes. Followers of the 'Fast 800' are encouraged to consume only 800 calories (or approx. 3347 kilojoules) per day for up to 8 weeks.

What are the rules of The Fast 800 diet? ›

What are the rules for The Fast 800 diet?
  • Eat 800 calories every day.
  • Eat a moderately low-carb Mediterranean diet.
  • Exercise regularly - a mix of short HIIT and resistance training sessions.
Sep 21, 2023

What does an 800 calorie diet consist of? ›

The plan starts with a rapid weight loss phase: this lasts between two and 12 weeks, during which you follow a daily 800-calorie eating plan. You do this by following a moderately low-carb, Mediterranean-style diet, with lean protein sources and vegetables.

What foods can you eat on Fast 800? ›

Foods to enjoy
  • Start the day with eggs. ...
  • Full-fat yoghurt is also good. ...
  • Have high-quality proteins. ...
  • Eat more healthy fats and oils. ...
  • Eat different coloured veggies. ...
  • Fibre is good. ...
  • Dairy products are back in. ...
  • Nuts are also included.

What does Michael Mosley eat in a day? ›

The Fast 800 diet is a form of intermittent fasting, where you stop eating for a large part of the day, and the rest of the day's food is inspired by a Mediterranean Diet. Dr Mosley fasts for 12 hours a day, he told SBS, waking at 7am and having his breakfast at 8am after an hour of exercise and work.

Can you eat potatoes on Fast 800? ›

Potatoes can spike your blood sugar as they have a relatively high glycemic index, and provide very little significant nutritional value. For this reason, we've switched them out for carrot, celeriac and parsnip chips instead.

Are bananas ok on Fast 800? ›

Dr Mosley, who created the Fast 800 diet and popularised the 5:2 diet, claims bananas aren't as beneficial as you think when it comes to weight loss. He acknowledges you should eat fruit and veg, but urges dieters not to eat more than seven portions in a day.

How many pounds will I lose if I only eat 800 calories a day? ›

Very Low-Calorie Diet (VLCD)

On a VLCD, you may have as few as 800 calories a day and may lose up to 3 to 5 lb (1.5 to 2 kg) week. Most VLCDs use meal replacements, such as formulas, soups, shakes, and bars instead of regular meals. This helps ensure that you get all of the nutrients you need each day.

How long can you stay on The Fast 800 diet? ›

The Very Fast 800 requires following a fasting approach of 800 quality calories every day for a minimum of two and a maximum of twelve weeks. You're encouraged to incorporate time-restricted eating (TRE), exercise and mindfulness to round out the benefits of The Fast 800 lifestyle.

What is fast 800 in a nutshell? ›

The Very Fast 800 involves eating 800 calories a day, with a focus on low-carb Mediterranean-style food. People following the diet can choose to split their calories between either two or three meals - if two, they may combine it with time-restricted eating and adopt a limited eating window.

Can I eat bread on Fast 800? ›

Foods to eat on fasting days

If you eat simple carbohydrates, like white pasta, white bread, chips and chocolate, that spike blood sugar quickly, your pancreas will release insulin attempting to mitigate hazardous changes in blood sugars.

What foods keep you full when fasting? ›

Fruits, vegetables, and whole grains are high in fiber, so they can help keep a person feeling full and satisfied. Healthy fats and proteins can also contribute to satiety. Beverages can play a role in satiety for those following the 16:8 intermittent fasting diet.

Is Fast 800 same as keto? ›

It is more effective than a conventional keto regime, healthier and more sustainable. The secret to this new approach is that it combines keto with intermittent fasting, which means you go into ketosis faster, while also being able to enjoy delicious Mediterranean-style food.

What does Michael Mosley recommend for breakfast? ›

Dr Mosley said his best four breakfasts were porridge, overnight oats, eggs - especially omelettes and kippers.

How to start The Fast 800 diet? ›

Rapid weight loss approach option 1: The Very Fast 800
  1. Consuming about 800 calories a day.
  2. Moderately low-carb, tasty Mediterranean-style food developed by our in-house nutritionist (vegetarian and non-vegetarian options)
  3. Eating two or three meals per day, whichever best suits your lifestyle.
Nov 23, 2023

What is the eating window for fast 800 diet? ›

Starting with a 12:12 method (fasting for 12 hours and eating within a 12 hour window) can help ease yourself in. Then build up to 14:10 or 16:8 when you feel more confident. Don't forget your liquids: Staying hydrated is key for both intermittent fasting and sleep.

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