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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.

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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 26th February

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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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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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