It will help you to lose weight effectively, improve brain function and boost productivity.


Would you like to reach and sustain your ideal body weight?

Then 21 Day Intermittent Fasting Challenge is exactly what you need!

For 21 Days you will follow a clear daily fasting plan which will get you into the lifestyle of Intermittent Fasting, help you lose weight and wake up energized, and mentally sharp every day. 

During the Intermittent Fasting Challenge you will get to try the most sustainable method of Intermittent Fasting – 16/8 Fasting method. It means – consuming all your food during 8 hours window and fasting for 16 hours.

You will receive all the tools you need to successfully make Intermittent Fasting a long lasting habit. Daily email check-ins packed with actions to support your Fasting, tips, recipes and educational expert videos to keep you motivated and engaged over the course of the entire 3 weeks.

In addition, you receive a powerful 21-Day Intermittent Fasting Meal Plan that will help you to lose weight and ensure a balanced nutrition during the 21 days. The meal plan includes daily macros, recipes and weekly shopping list for your convenience. 

We break down all the information you need to know in short digestible format and deliver it day after day, following the methods of habit building.

3 main benefits you can expect after successfully completing this challenge*:

Lose weight with Intermittent Fasting

Lose 5-10 Lbs
(2-5 Kgs) in 3 Weeks*

Reduce body fat with intermittent Fasting


Improve nutrition and relationship with food


All benefits of Intermittent Fasting:

  • Lose weight and reduce body-fat percentage
  • Increase metabolic rate
  • Reduce blood pressure
  • Reduce blood sugar levels and risk of Type 2 Diabetes
  • Improve brain function and increase productivity
  • Induce cellular repair processes
  • Increase longevity
  • Boost your immune system, reduce inflammations and rejuvenate skin

Here's what our community on Facebook is saying about the challenge

Challenge Guidelines:


Hours eating

Consume all your food within the 8 hr window


Hours fasting

Pick a fasting window that suits
your personal schedule


Stick to the same eating/fasting schedule throughout the challenge​

All of this included when you sign up today:

21-day Intermittent Fasting Challenge Guide
Information on all you need to know about intermittent fasting
Frequently asked questions on Intermittent Fasting
Progress tracking sheet
21-day Intermittent Fasting Meal Plan
Nutritional information and tips on Intermittent Fasting
Frequently asked questions on nutrition
Weekly shopping list
Recipes for 21 days (2 meals + 1 snack a day)
Ingredients, recipe directions and full nutritional info for each meal
  • E-book 21-Day Intermittent Fasting Challenge Guide (pdf)​
  • 21-Day Intermittent Fasting Action plan​ (pdf)
  • Daily action and inspiration in your inbox. No App needed!
  • Progress Tracking Sheet​ (pdf)
  • Exclusive community of like-minded people from all over the world

FREE BONUS: 21 Day Meal Plan

  • 21 Day Intermittent Fasting Meal Plan for Weight Loss (pdf)
  • 2 Meals a Day + 1 Snack, incl. all macros and recipes
  • Weekly shopping list for your convenience


The 3-Week Curriculum in a nutshell

Once you sign up, you’ll get all the material you’ll need to succeed once you start the challenge. 

Challenge guide, Daily Plan, Meal ideas and Facebook community of people who are on the same journey. You will also get a Meal Plan to help you lose even more weight and ensure a well balanced nutrition. That’s what makes this challenge so powerful! 

You will get introduced to different fasting methods, get an overview of foods you can eat (and not), learn about side effects & how to avoid them, how to combine IF with sport, and much more. 

Enroll now! 

The first week sets the foundation for Intermittent Fasting. You will focus on educating yourself about Intermittent Fasting, finding your own fasting schedule that fits your lifestyle and learning how to curb the first hunger attacks.

You will slowly ease into 16/8 Fasting method during the first couple of days, starting with 12/12 fasting first.

You will also learn how to adapt your diet to get the best results and how to incorporate training to best fit your new eating pattern.

Sounds good, right? Join the challenge today.

The second week of the challenge will involve some changes to your diet and fasting timing. Once you feel comfortable with fasting daily, you will get to test your limits and extend the fasting period for a few hours.

Toward the end of the week, you will be introduced to the basics of healthy eating to compliment your new healthier lifestyle.

Are you ready? Join today, start on Monday.

The last week of the challenge is focused on making sure the habit you have developed stays with you for life. You will learn about different types of Intermittent Fasting and tools you can use to stay on track with Intermittent Fasting after the challenge is over.  

In addition, we will help you to build upon your knowledge of healthy eating: you will learn how to make smarter choices and what to pay attention to when deciding on your meals and choosing the snacks.

Includes: daily tasks, pre-recorded videos with experts, motivational tips, access to Facebook group, weekly progress tracking.

Get ready and sign up now!

More Intermittent Fasting Reviews


Intermittent Fasting Healthline

Available Dates:

The challenge starts every Monday and you will get grouped with others joining the Challenge on the same date (optional, on Facebook group). This is also when you will start receiving your daily Challenge material. 

E.g. , If you sign up for a Challenge on a Wednesday, you will join the upcoming Monday’s challenge.

If you sign up for a Challenge late on a Sunday night (past midnight, so technically Monday am), you will get to wait for the next Monday week after to start the challenge. 

Don’t miss it out – Secure your spot before it’s gone!

21 Day Intermittent Fasting Challenge + MEAL PLAN INCLUDED(!)
intermittent fasting challenge bundle
  • 21 Day Challenge Action Plan
  • E-book 21-Day Intermittent Fasting Challenge Guide (pdf)​
  • Daily actions, inspiration and e-mail check-ins
  • Lifetime access across all your devices
  • Exclusive community of like-minded people from all over the world

21 Day Meal Plan

  • 21-Day Intermittent Fasting Meal Plan for weight loss (pdf)
  • 2 Meals + 1 snack, incl. detailed recipes and macros
  • Weekly shopping list for ultimate convenience
  • Regular diet, Keto, Vegan, Paleo, Vegetarian and Vegan Keto plan options available
$ 49
One-time payment in USD
50% OFF


It’s quite simple. 

  1. Immediately after signing up, you will receive your login to the 21 Day Hero Member Zone. Your login information will also be sent to your per email.
  2. Once you login to the Member Zone, you will be able to see your Challenge  and Meal Plan on the Dashboard.
  3. Click on the respective Challenge to access your onboarding material and Challenge Guide pdf.
  4. Starting from Day 1 till 21, you’ll be getting daily info with a clear action to take + daily knowledge and inspiration nugget. Daily content unlocks each day of the challenge on the Member Zone . In addition, you will also receive a daily reminder per e-mail.
  5. You’ll be able to track your overall challenge progress on the Dashboard and also using the Progress Tracking Sheet in the Challenge guide.
  6. To make sure you’re getting the most of your challenge, you will get invited to join an exclusive Facebook community. Your habit coaches and other challenge takers will be there to check in with you regularly and ask any questions you might have.

** The Challenge starts on a Monday! 

Once you sign up for the program, you’ll receive a confirmation e-mail with your Member Zone login.

Once you login to the Member Zone, you will find your Intermittent Fasting Challenge Page with Challenge Guide Ebook and next steps described. You will also be able to see your Intermittent Fasting Meal Plan on the dashboard.

You can choose between Regular-Omnivore diet, Keto, Vegan, Vegan Keto, Vegetarian and Paleo diets. The meal plans are designed for weight loss. 

You can also choose the calorie level – we have 3 alternatives based on your gender and activity level:

  • 1200 calorie meal plan
  • 1600 calorie meal plan
  • 2000 calorie meal plan  

Read more about our meal plans here

  • If you are female with no or little physical activity (up to 2x a week) -> 1200 kcal
  • If you are female with moderate physical activity (3x a week and more) -> 1600 kcal
  • If you are male with no or little physical activity (up to 2x a week) -> 1600 kcal
  • If you are male with moderate physical activity (3x a week and more) -> 2000 kcal

Read more about our Meal Plans here

In addition to the Meal Plan, you also receive a list of universal healthy meal suggestions you can have while fasting, so you can learn how to use Intermittent Fasting after you finished the Challenge.

You can use them as inspiration for your meals once you have completed the Meal Plan (after the Challenge). 

Let’s be honest, free things do not motivate us. Cognitive psychologists found out why and they call it loss aversion. In simple terms, we are more motivated by fear of losing rather than a satisfaction of gaining.

It might sound counter-intuitive, but by paying for this challenge, you have a higher chance of successfully completing it and therefore enjoying all the benefits associated with the Intermittent Fasting.

Also – it supports us and our team to keep providing you a ton of useful content that we share every week for free.

Joining Facebook group is optional – it’s a great chance to interact with others and make connections, yet you can perfectly fine do the challenge without joining the group. 

You will receive daily content and emails from us to keep you motivated, and can always reach out to our team through email if needed.

If you haven’t received your email from 21 Day Hero, please check your spam/junk and promotions folder – it might have accidentally landed there. You can also make a search in your inbox for an email from hello@21dayhero.com.

If after doing the search you are still unable to locate our email, please reach out to us on support@21dayhero.com . We will do our best to help you out!

Yes, all our products are a one-time payment and not a subscription.

If you want to continue your diet after the 21-day period, you will have to purchase a new meal plan. Or continue with a new challenge. No additional charges will ever occur.

Challenge benefits reflect the real-life experiences of individuals who have finished our 21-day challenges or are based on scientific studies related to the challenge topic. However, individual results may vary and we do not guarantee you will experience the same benefits and results as others.

In the days when we might feel like our data is mistreated more often when we want to, at 21 Day Hero we put a great emphasis on making sure your privacy is respected at all times.

As stated in our Privacy Policy, we do not and will never share any personal data we collect (like Name and Email) with any third-parties. 

Well, it’s definitely on us. We’d love to hear more about your questions, concerns or suggestions at support@21dayhero.com 

6 things that make this challenge
worth it

The principles to better health

Intermittent fasting has been around in various forms for ages and has been proven by science to have a significant impact to longevity and disease prevention, such as diabetes, cancer and cardiovascular disease. In addition, restricted time eating has helped many to gain back control of their bodies and shed unwanted weight.

Proven Habit Building science methods

At 21 Day Hero, we use behavioral change psychology of taking tiny steps daily to reach great results over time. During the 21-Day Intermittent Fasting challenge, we help you ease in into Fasting so it is easy to start, identify your triggers for bad behavior, define your daily actions and reward you for taking them.

Improve nutrition and relationship with food

No special food required

Unlike many other diets, you do not have to say ‘No’ to your favourite foods or invest in expensive supplements. Intermittent Fasting is effortless as you can keep eating the same meals you used to, except for adjusting the timing. Over time, you will gain more control of your eating habit and will naturally start craving for healthier alternatives.

Asset 10@2x

Learning more every day

During the challenge you focus on learning one thing at a time without spending more than 10 minutes a day. Not only will you learn more about Fasting and how to make it work for you, you will also get introduced to the basics of healthy nutrition.

Reduce body fat with intermittent Fasting

Developing a long-lasting change

The 21-Day Intermittent Fasting Challenge is designed to help you develop a habit of eating according to the 16:8 method and make the new eating pattern a sustainable routine. The more days you repeat your new habit, the stronger it becomes and the easier it gets.

fast fasting

Keeping you engaged

While participating in the challenge, you receive unlock daily content on the Challenge Page with special tasks for each day. This keeps you motivated to continue your fasting journey and empowers you to achieve greater results. Also, the daily e-mail reminders act as a powerful accountability support system.

Not that it matters...but these celebrities swear by Intermittent Fasting

Famous people that do intermittent fasting

*DISCLAIMER: Challenge benefits reflect the real-life experiences of individuals who have finished this 21-day challenge. However, individual results may vary and we do not guarantee you will experience the same benefits and results as others.

Information on this site is for educational and informational purposes only. You should not rely on this information as a substitute for, nor does it replace, professional medical advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other health-care professional. Do not disregard, avoid or delay obtaining medical or health related advice from your health-care professional because of something you may have read on this site. The use of any information provided on this site is solely at your own risk.


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