The Fast 800

In-app purchases
5.0
615 reviews
10K+
Downloads
Content rating
Everyone
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About this app

The Fast 800 is a personalised trainer and nutritionist, ready when you are, to support long-term weight loss and better health.

Developed by Dr Michael Mosley and independently validated by healthcare advisors, nearly 100,000 members have found success with our easy-to-stick-to programme.

With its personalised plans using science-based methods, The Fast 800 has helped thousands achieve their goals with intermittent fasting and the highly acclaimed Mediterranean-style diet. Our Programme is the easiest, most convenient way to learn how to improve your health, with the tools to help you do it and real, delicious recipes to ensure you enjoy it.

The Fast 800 is all you need to keep yourself accountable and start improving your health in a sustainable, delicious way. Via the app, you have access to:

- 18 healthy, nutritionally balanced meal plans
- Options for keto, vegetarian and 5:2
- A library of 700+ delicious recipes
- Daily guided workouts
- Low-impact to advanced exercise
- Resistance and HIIT training guides
- Pilates, yoga and stretching library
- Mindfulness guides and audio meditations
- Health Coach and Community support

While many people join The Fast 800 to lose weight, and lose more than 6kg in 12 weeks on average, the goal of the programme is actually to improve your health. As it so happens, weight loss is a consequence of that.

Over the years, members have seen significant improvements to their health, from reversing type 2 diabetes, to improving blood pressure and reducing the amount of medication they take.

At 54 years old, Helen, lost an astounding 21kg with The Fast 800 Programme. Helen was previously dealing with thyroid issues, fatigue and pain in her knees and hips. Since joining the programme, she's left that life behind and now lives pain-free.

“Over 13 weeks, I lost 21kg, which was a huge emotional journey. I've successfully reached the weight I was 25 years ago. Before I started The Fast 800 Programme, I was overweight and lethargic. I had issues with my thyroid and pain in my hips and knees (so much so, it was painful to walk). I had no self-discipline when it came to eating and I knew it was time to do something about my health.”

Finding better health shouldn't leave you feeling tired and hungry. Start your personalised programme and finally find what works for you.

Join today and have your meal plan and shopping list in minutes!

Consult your healthcare professional before beginning any diet or fitness regime. Any advice given is general in nature and not meant as a substitute for care by your usual health professional. For any further questions, please email us at info@thefast800.com

FAQs: https://thefast800.com/frequently-asked-questions/
Privacy policy: https://thefast800.com/privacy-policy/
Ts&Cs: https://thefast800.com/programme-terms-conditions/ and our Medical disclaimer: https://thefast800.com/medical-disclaimer/
Updated on
23 Sept 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity
This app may collect these data types
Personal info, Financial info and 4 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

5.0
580 reviews
Sandra Guy
3 September 2025
So easy to follow. Lots of tasty and interesting food options. Exercise to suit everyone and encouragement.
2 people found this review helpful
Did you find this helpful?
The Fast 800
10 September 2025
Hi Sandra, Thank you so much for this wonderful feedback! We are thrilled to hear that you find the programme easy to follow and that you're enjoying the food options and exercise. It's great to know you feel supported, and we look forward to helping you continue on your health journey. Kind regards, The Fast 800 team :)
Howard Corlett
13 May 2024
Overall I'm very happy with the app. I particularly like being able to print out the weeks shopping list. I also like the option to swap meal suggestions although sometimes there is only 1 alternative. It would be good if you could add certain foods that are a no no, so that meals that contain them, don't come up. I have difficulty with beans and pulses. Quite often, the app will get stuck and I have to restart my phone, which is brand new so I don't think it's the phone that's at fault.
8 people found this review helpful
Did you find this helpful?
J Young
13 April 2024
I have done the fast 800 in the past with the books but the app makes it so much easier...all your meal plans, shopping lists, work outs and support with the "community" all there for you. Especially when you are working. You can swap meals and plans... it's all about what's best for you. It's kept me motivated and even after the 12 weeks we're up, I'm still using the app for maintenance and motivation. The workouts and mindfulness are brilliant too and it's all evidence based!
18 people found this review helpful
Did you find this helpful?
The Fast 800
21 April 2024
Hi J Young, thank you for your rating and review :) We are so pleased to hear that you have found the different parts of the programme helpful, including the meal plan, shopping lists and the Community. Well done on your progress so far and all the best to you in continuing your journey! Kindly, The Fast 800 Team

What's new

This update contains a new Very Fast 800 High Fibre meal plan and improvements to the personalisation quiz, plus bug fixes and enhancements.