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21-day keto intermittent fasting Challenge

Intermittent Fasting Money Back Guarantee Plan
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Lose weight & reduce body fat %

87% of participants lost 5-10 lbs (2-5 kg) in just 21 days.

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Improve relationship with food

9/10 participants felt more in control of their cravings and hunger.

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Reduce hunger & increase energy

All participants reported feeling less hungry and more energized during keto diet.

Your weight loss journey starts next Monday in:

🎆 Limited time offer 2 for 1 🎆

Buy this Challenge and get 1 FREE Meal Plan or Challenge

Join over 500

people who have successfully lost weight with our Intermittent Fasting Challenge

Intermittent fasting weight loss results.

Read more in our article here.

Start next Monday

And see your weight disappear!

Challenge Guidelines:


Hours eating

Consume all your food within the 8 hr window


Hours fasting

Pick a fasting window that suits your personal schedule

0 %

Net carbs

20-50g net carbs per day
(following personalized Meal Plan)

How does 21 day challenge work?

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Sign up & get all info instantly on members zone

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Unlock daily tasks + email reminders

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Achieve more with accountability group

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Track your progress & Results

What will you learn?

The 3-Week Curriculum in a nutshell

As soon as you sign up for the Challenge, you will receive prompt access to a comprehensive Challenge Guide, 21-day Meal Plan and Recipes book, that allows you properly prepare for the start!

You will find info on the challenge guidelines, how to start intermittent fasting, how to calculate net carbs, what to drink and eat (and not), how to avoid side effects, get tools to track your progress and much more!

It’s not just about strictly following the meal plan. The challenge provides you tools to nail Keto Intermittent Fasting diet and make it a sustainable lifestyle. You will receive daily check-ins packed with educational information on Keto and Intermittent Fasting, what foods to eat, Keto friendly recipes and further tips to accelerate your ketosis.

With our daily emails, you get to track your success, keep motivated and engaged over the entire 3 weeks.

During the first week of the challenge, you will be introduced to the basics of the Keto Intermittent Fasting diet, the science of Ketosis and learn how to ease into the new way of eating. You will receive a comprehensive list of foods you can eat (and shouldn’t!) and get tips on how to plan your fasting/eating window and upgrade your cooking skills to fit the Keto lifestyle.

In addition, you will be introduced to habit-building science and as part of it, learn to identify the cues that trigger your food temptations. With help of few simple rules, we will show you how to define a solid action plan for success.

In the second week, you will be fully doing Intermittent fasting 16/8 schedule, learn more about Keto nutrition and will be introduced to the powerful strategies that will allow you to stay on track with your goals. We will look deeper into different actions and tools that will help to test Ketosis and escalate your results. As the week advances, you will get to apply more behavioral science methods to ensure the success of your new lifestyle.

The last week of the challenge is focused on making sure you can sustain the Keto Diet and Intermittent Fasting once the challenge is over.

You will get to try a strict macro tracking to test how your body and mind reacts to the more advanced Keto strategies. At the end of the week, you will find yourself in better shape, notice clearer skin, less inflammation and will feel more energized and focused through the days.

Intermittent Fasting was covered in:

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Limited spots available, secure your place now!

Your Challenge dates:

Start next  Monday

Finish in 21 days

Time left to sign up and become your healthiest self:

🎆 Limited time offer 2 for 1 🎆

Buy this Challenge and get 1 FREE Meal Plan or Challenge

Join the
21-day challenge

21 Day Keto Intermittent Fasting Challenge
keto intermittent fasting for beginners

Free Bonus when you sign up now:
21-day meal plan

$ 147
One-time investment in USD
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Frequently Asked Questions

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 the 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.

Once you sign up for the program, you’ll receive a confirmation e-mail with your Member Zone login where you will find the Challenge Guide, Meal Plan and Recipe Ebook along with a checklist for the next steps. 

  • 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

Our challenge is based on the following rules:  max 20g-50g of carbs a day (depending on the meal plan you choose) and focus on high quality fat.

As part of the challenge, you receive a 21-day Keto Intermittent Fasting meal plan as well as recipe book which provides you ideas for additional meals. 

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 drinking more water and reducing intake of other beverages.

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

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

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

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. 

Due to the nature of the intellectual property, we are not be able to provide refunds after the purchase. Exceptions can be made in the case of a medical emergency accompanied by reasonable evidence, or if you contact us at

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

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.