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4.5

Dr Michael Mosley with mobile phone

What is The Fast 800?

The official home of 5:2 and intermittent fasting

Developed by Dr Michael Mosley and a team of nutritionists and doctors following the latest science, our step-by-step programme helps you lose weight fast and keep it off. With tailored meal plans, workouts and support we make it easier to get healthier and activate your body’s ability to burn fat.

Create sustainable habits

Feel fitter

Improve blood sugars

Lose weight

Live better and longer

Reduce risk of chronic disease

What our members say

We've helped over 100,000 people just like you lose weight, keep it off and improve their health

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What's included

Personalised meal plans to suit your goals

  • Vegetarian and Keto options
  • Nutritionist-made with macros and calorie counts

200 guided workouts, no equipment required

  • Low impact beginner to advanced fitness
  • Resistance, cardio, yoga and pilates

700+ simple and tasty recipes

  • Automated shopping lists
  • Satisfying portions and a range of global cuisines

Real support, as you need it

  • Member-only Health Coach support
  • Be part of an interactive cohort

Member-only app for ultimate convenience

  • Weight loss tools in the palm of your hand
  • Use your programme any time, anywhere

Behaviour change course and mindfulness

  • Science-backed support to make new habits stick
  • 40+ guided mindfulness videos

What does it cost?*

12 week programme

( – select your currency when you sign up)

This gives you access to the 12 week programme plus one extra month of membership to The Fast 800. After that, your ongoing monthly membership is . You can cancel this monthly membership at any time. *This price structure is only available via the website.

7 day free trial

Start your personalised programme now with your first 7 days absolutely free

Sign up today and your free trial begins immediately. Week 1 of your programme will start on:

Monday 22nd April

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How it works

Our flexible dietary approaches are designed to suit your goals and circumstances. Learn The Fast 800 way so you can tweak your approach as your needs change. It's more than a diet - it's a sustainable approach to a healthy lifestyle.

Personalise your programme

  • Sign up and take our assessment
  • Your programme is set with the right approach for your goals and circumstances
  • Switch easily between each approach as your needs change

Lose weight and reprogramme your body

  • Follow your meals and exercise plan
  • Learn the science as you go
  • Engage with your cohort and health coaches
  • Track your progress

Learn to live a healthier life

  • Incorporate The Fast 800 healthy habits into your daily routine
  • Tweak your programme settings to suit you best
  • Sustain your results

With delicious meals to enjoy, not endure

Our low-carbohydrate, Mediterranean-style meals are nutritionally balanced to keep you fuller for longer and promote rapid fat burning. They are easy to prepare and of course, taste great!

As seen in

Dr Michael Mosley explains the biology behind weight loss

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The science behind The Fast 800

The biology behind weight loss

Burning energy 101

Your body mainly runs on two types of fuel: sugar (in the form of glucose) and fat. When it uses glucose, fat is stored in the body.

The sugar problem

When you have more glucose than your body needs for energy, it eventually gets stored as body fat. This commonly happens when someone eats a high-carbohydrate (sugar & starch) diet.

How to burn fat

When you eat a low-carb diet, your body has less glucose to run on. So, it starts to use your fat stores instead. You can fast-track this process by intermittent fasting.

The Fast 800 Programme will teach you how to combine delicious food with intermittent fasting so you can burn through excess fat stores and return your body to health.

What to expect while following The Very Fast 800

Click on the timestamps to see how the typical body responds over 12 weeks to our most popular approach

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Blood sugar

You may see a stabilisation

How you feel

Less hungry, with more energy and motivation

Weight loss

Potential weight loss

Body fuel

Fat

What's happening?

The body is likely in ketosis, and is adapting well to using fat as fuel. Motivation to continue will increase as the scales start to shift. Weight loss will differ from person to person.

Blood sugar

You will see a stabilisation

How you feel

You may feel more positive

Weight loss

Less hungry with more energy and motivation

Body fuel

Fat

What's happening?

Metabolic health is improving. Your body is using energy more effectively and is able to switch between glucose and fat for fuel. Weight loss may stall for a few weeks, which is normal as the body continues to adjust.

Blood sugar

You should see a stabilisation

How you feel

Sleeping well. Sustained energy and motivation

Weight loss

Sustainable weight loss

Body fuel

Fat

What's happening?

You're in a good routine and have sustained energy for exercise. Your metabolism switches between glucose and fat burning easily. You may see a return to stable weekly loss of around 1lb/0.5kg a week.

Blood sugar

You should see a stabilisation

How you feel

Strong and motivated to continue with your health goals

Weight loss

Overall, significant weight reduction

Body fuel

Fat

What's happening?

Your body can now use the energy from your food efficiently. Insulin sensitivity has improved, meaning less insulin is required to control blood sugar levels. Your health is on track and you can feel the difference!

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The Fast 800: Australia’s Leading Online Weight Loss Program

The Fast 800 is Australia’s leading choice for achieving fast weight loss with a scientifically-backed approach. Our comprehensive online weight loss programs are tailored to fit your lifestyle, offering you the guidance and support you need to reach your health goals. Whether you’re seeking a structured weight loss meal plan in Australia or flexible online options, The Fast 800 has you covered.

Step into a world of health and transformation with The Fast 800, Australia’s leading online weight loss program. Embrace the journey towards a healthier, more vibrant you with our customised meal plans and comprehensive support. We’re here to guide you every step of the way, ensuring your path to weight loss is not only successful but also enjoyable and sustainable.

Our Program

  • Customised Weight Loss Meal Plans: Dive into our personalised weight loss meal plans, specifically designed for fast weight loss in Australia. Our plans are crafted to suit your individual dietary needs and preferences, ensuring you enjoy delicious, nutritious meals while on your weight loss journey.
  • Comprehensive Online Weight Loss ProgramsExperience the convenience and effectiveness of our online weight loss programs. With The Fast 800, you have access to expert advice, community support, and a wealth of resources at your fingertips, all accessible from the comfort of your home.
  • Support Every Step of the Way: Our program is more than just a diet plan; it’s a holistic approach to weight loss. From nutritional guidance to fitness tips, we provide comprehensive support to help you every step of the way.

Join The Fast 800 Community

Embrace a healthier lifestyle with The Fast 800’s online weight loss programs. Join our community of like-minded individuals in Australia and start your journey towards effective and sustainable weight loss today.

Get Started With The Leading Weight Loss Meal Plan In Australia

Embark on a health journey with The Fast 800, where your aspirations for fast and sustainable weight loss become a reality. Our tailored online weight loss programsand meal plans are specifically designed for the Australian lifestyle, offering you the perfect blend of convenience, support, and expertise. Join our thriving community and take the first step towards a healthier, more vibrant you. With The Fast 800, a successful and rewarding weight loss journey is more than a possibility and we’ve seen thousands of people achieve their weight loss and health goals.. Start your journey today and experience the change you’ve always desired. Your path to wellness begins here, with The Fast 800.

Frequently Asked Questions

Browse through our most commonly asked questions

How much does the programme cost?

Joining is as easy as clicking here in order to join via our website, OR making payment via the Google Play / App Store. (Search for The Fast 800!)

If you join via our website, you will pay £119 / AUD$199 / USD$149 for your initial 12 weeks’ access.

Access thereafter is at £12 / AUD$22 / USD$15 per month. This payment will renew automatically until it is cancelled. You can stop your membership at any time via your Profile page.

To take advantage of more payment options (including a monthly format) or to pay in your region’s currency, you may wish to pay via the Google Play / App Store. Simply proceed through the signup and checkout process to see pricing options.

Please note:

  • All offers are ONLY available through website signups
  • You can still download and use the app once you have signed up via our website

What’s included in the Programme?

Our Programme teaches you the health benefits of a moderately low-carb Mediterranean-style diet, so it becomes a way of eating for life. It is based on the latest science and takes an evidence-based approach to healthy living focusing on nutrition, movement, behavioural change and sustainable lifestyle.

It includes:

  • Education around science-based lifestyle best practice
  • Weekly, time-saving meal plans – vegetarian and non-vegetarian – with automated shopping lists
  • The Very Fast 800, The New 5:2 and The Way of Life approach plans, some with Keto options
  • Exercise plans, incorporating HIIT and resistance training, designed for beginner to advanced levels as well as a library for further stretching, yoga and pilates videos
  • Trackers to measure waist, weight, HbA1C, mood and sleep
  • 700+ easy and delicious, nutritionist-developed recipes
  • Mindfulness meditations
  • Core learning content, plus access to exclusive articles
  • Support tools for liaising with your usual treating doctor
  • Access to a lively Community so you can chat with your fellow members and/or ask our online health coaches for support

How does the free trial work?

Your programme for weight loss and long term health starts straight away.

When you click “start now”, you’ll be asked to create an account. Once your account is set successfully, please go through the checkout process, which requires you to enter credit card details, to trigger your access to the personalisation quiz and the start of your 7-day free trial.

Your credit card will only be charged if you do not cancel prior to the end of the trial period.

Please note, once you cancel the free trial, you will lose access to your account straight away.

Who should avoid a low calorie diet or fasting?

The Fast 800 programme is not recommended for the following:

  • People who are underweight and/or experiencing an eating disorder, or have a history or suspicion of an eating disorder
  • Children (under 18 years old)
  • Type 1 diabetics
  • Pregnant women, breastfeeding mothers or anyone undergoing fertility treatment
  • People who have a significant psychiatric disorder or substance abuse
  • People who are under active investigation or treatment, or have a significant medical condition affecting ability to comply with diet
  • People who have had a recent cardiac event, myocardial infarction or cerebrovascular accident (<3 months previously) or other heart abnormalities
  • People who have had uncontrolled heart disease, uncontrolled hypertension, or kidney failure
  • People who are feeling unwell, have a fever, are frail or recovering from significant surgery (<6 months ago)
  • People who are on insulin. This is to avoid a potentially dangerous drop in blood sugar (hypo)
  • People who are on ‘flozin’ medication (known as SGLT2 inhibitors, taken to reduce blood sugars). This is to avoid the rare complication and potentially dangerous condition called euglycemic diabetic ketoacidosis (DKA), where despite having normal or only mildly raised ketones the medication can mask a serious complication of diabetes requiring urgent attention

Please read our medical disclaimer for additional information.

How much weight will I lose?

The DIAMOND Study performed by Oxford University and Dr Clare Bailey looked at the feasibility of using an 800 calorie, low-carb, med-style diet as a treatment for people with type 2 diabetes.

After 8 weeks the average weight loss was 9.5kg, sustained over the course of the trial.

Results also included a significant drop in blood sugars, blood pressure and the use of medication.

Can I re-start the 12-week Programme after I start?

As the Programme is guided, you are unable to pause or restart the course.

You can view content from previous weeks and you also receive a free four week trial of the monthly subscription service at the end of the 12-week Programme, to allow you to catch up on any missed content.

When does Week 1 start? Why is there “prepare” time?

Please be aware that Week 1 starts the Monday following sign-up. The time in between sign-up and Week 1 is called the Prepare period, and is designed to give you time to have a look around the Programme, start planning your shopping list and recipes, try a workout or two, and get used to how the programme runs and works.

Please ensure that you are signing up according to how much Prepare time you would like before Week 1 commences – for example, if you would like a full week of Prepare time, please sign-up on a Monday or Tuesday, and if you would like to start Week 1 right away, please sign up on a Saturday or Sunday.

If you have any issues with the start date of your programme, please get in touch via our Contact Us form.

Why 800 calories?

800 is the generally accepted number of calories used to achieve weight loss in scientific studies. Professor Roy Taylor, leading researcher into the reversal of type 2 diabetes, used 800 calories in his test group in the DiRECT Trial.

We have found that 800 calories is high enough to be manageable for most members, but low enough to trigger a range of desirable metabolic changes.

Do I have to give up coffee, smoking or alcohol?

No, you don’t have to give up any of these whilst following the Programme although, obviously, we would certainly advise everyone to stop smoking as soon as possible, irrespective of their blood sugars.

Coffee and alcohol are still allowed on the programme although the calories in both of these drinks need to be included in the daily calorie limit (noting that alcohol is highly calorific).

A pint of beer or a large glass of wine contains 180 calories, so really best avoided or kept to a minimum.

The good news is that red wine is included in the Mediterranean-Style diet, so once you finish The Very Fast 800 and The New 5:2, and move onto ‘The Way of Life’ approach you will be able to introduce alcoholic drinks back into your lifestyle (we go over this in more detail in the Programme learning content).

Black coffee and tea are fine although you will need to include any milks in your daily calorie count.

Still got questions? Please visit our full FAQ page or contact us and we’ll get back to you!

Typical results from The Fast 800

Based on data collected from 23,000 members

Weight loss

6kg 3 mths

Members following the online programme for at least three months lost an average of 6kg

7.3kg BMI > 30

Members who started with obesity (BMI >30) lost an average of 7.3kg after three months

Long term sustained weight loss

Waist circumference reduction

Improved blood sugar levels

Lower HbA1c levels

Frequently Asked Questions

Browse through our most commonly asked questions

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How much does the programme cost?

What's included in the Programme?

How does the free trial work?

Who should avoid a low calorie diet or fasting?

How much weight will I lose?

Can I re-start the 12-week Programme after I start?

When does Week 1 start? Why is there "prepare" time?

Why 800 calories?

Do I have to give up coffee, smoking or alcohol?

Still got questions? Please visit our full FAQ page or contact us and we’ll get back to you!

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