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Reset Your Gut, Restore Your Health, & Revitalize Your Routine

Start the new year with a 21-day challenge to set yourself up for optimal health and well-being in the coming year and beyond.

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21 Days to

Empower Your Gut in 2024 & Beyond

Everything you will learn is supported by research and based on the most current information. No need to visit Dr. Google because I’m delivering the truth, and nothing but the truth to guide you!

If there’s one thing we know it’s that a happy and healthy gut directly supports a happy and healthy mind. You’ll learn how to get your gut in check and experience all the joyful side effects.

No one ever sticks with something they don’t enjoy. That’s why having fun is built into every day and lesson of the challenge. Get healthy, rack up points (yes, there’ll be points!), and celebrate the wins Dr. B style!

Strong houses are built on solid foundations. Think of your habits as the keys to changing your life. I’m sharing the most effective actions that’ll build healthy habits that stick. You’ll feel a difference in your body within the first week.

Be prepared to have your taste buds blown away with 15 recipes you won’t find anywhere else. You’ll be craving these gut healthy super stars every day. I’ll even simplify your grocery store runs with weekly shopping lists.

Bottom line, folks, there’s nothing better than feeling good. And when you treat your mind, body, and microbiome well, you’ll have more energy, boost your brain power, and be excited to take on the day.

Your New Year’s Revolution, NOT Resolution

Here’s the deal: I know it’s not a novel concept to start a challenge on the first day of the year.

In fact, I bet you’re comparing my challenge to 7 different other programs and diets right this minute. I get it! You likely wouldn’t be surprised by how many of my patients tell me they’re holding out for January 1st to launch full force into their health goals.

There’s a reason challenges are so popular around this time — there’s a unique form of motivation that comes at the start of a new year, when you feel like you have a fresh slate.

Whether it’s keto, paleo, Whole30, WW (formerly known as Weight Watchers), or targeting calories, carbs, macros, or the Peanut Butter Diet (yes, that’s a thing) – people approach the beginning of the new year as THE time to upend their health habits for the better. But holy rules to follow, Batman!

When you choose your diet based on what you’re told to remove and restrict, your relationship with food suffers and your understanding of what’s healthy becomes severely skewed.

The diets listed above are not only restrictive, they all fail to focus on what’s truly important: YOUR GUT. Yes, a couple of them might claim gut healing as a side-benefit, but they simply don’t have the science to back it up.

That’s where I come in, and that’s what Microbiome 21 is about at its core. Because your gut microbiome is the core of your health. These 21 days are not just about shedding some pounds and collecting a badge of endurance. This challenge is about gaining energy, long term vitality, learning habits you can actually stick with, and understanding that the health of every system in your body starts in the gut.

If you know anything about me, it’s that I come with receipts – AKA science-backed research. There is nothing anecdotal in Microbiome 21. 

Each day of this challenge, every habit I will teach you, and all of the knowledge you will gain is all based on nutritional science.

It’s time to show New Year’s resolutions the door, and usher in the New Year’s revolution.

Microbiome 21 isn’t about what you have to take away. It’s a science-backed, evidence-based approach to optimal health — and frankly, if I do say so myself, it’s a heck of a lot of fun. Most importantly, this isn’t a 21-days-and-you’re-done kinda deal. Unlike some of the most popular diets and New Year’s resolutions, Microbiome 21 will demonstrate exactly how to establish habits and set a foundation for lasting health.

(Plus, you’ll track your experience from the beginning and when you start seeing positive changes — I’m talking within the first week — that’s when the real fun begins.)

Once you go through Microbiome 21, it’ll be there for you to return to if you ever need it. But if I’ve done my job right, you’ll never again need to start from scratch to get yourself back on track.

Maybe it’s been a long time coming, maybe you’ve been inspired by recent world events, or maybe you’re just ready to let science lead the way — any way you swing it, the time for your personal health revolution is NOW.

"But, Dr. B..."

That’s fair, because at the end of this, it’s you who’s got to make the change. Here’s where I come in: I’m a board-certified, award-winning gastroenterologist. I’ve written two New York Times bestselling books that demonstrate exactly how turbocharging your gut is the foundation for lifelong health. Plus, I’m a reformed junk-food junkie and this is the challenge I would take if I were starting my journey over again.

The answer is simple: Yes! This challenge isn’t a medical protocol or a meal plan. The fact is, there are few conditions that aren’t aided by healthier habits, and some of the concepts we’ll be working with here will actually help you get to the root of your gut issues and maybe even identify what your next best steps should be.

I developed Microbiome 21 as a tried and true (science-backed…and fun!) way to help people make needed changes in their approach to health. Habits at their core are about informed action. I plan to make it easier than ever before to make healthy habits part of your routine so your routine promotes health.

 

Good news – you don’t have to! Microbiome 21 isn’t about taking away. It’s about adding in. While I do not personally eat meat and you do not need meat to support a healthy diet, you’ll still love this challenge even if you’re not vegan or vegetarian. You can include meat with the recipes I’ll give you in this challenge, but I bet you’re going to love them all on their own.

When it comes to gut health, change happens fast even if you don’t realize it. A 2013 study in Nature by Lawrence A. David found that changes start to occur in the microbiome just 24 hours after making a dietary change. In 5 days there can be a dramatic shift. And in just 14 days, you can alter functional output.

Microbiome 21 will teach you how to set a foundation for optimal health. The more you understand how your gut connects to every system in your body, the better you’ll understand how to reach your personal goals — whether they be healing, refining, or restoring.

That’s great, I love to hear it! I still say yes, this is right for you, because this challenge is about empowering you with knowledge and delicious foods — who wouldn’t benefit from that?! People who took the challenge last year had all different circumstances, including being healthy as a horse, and they said they still learned new things to make choosing healthier actions easier.

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It’s All About

Habits, Information, & Action

21 Daily Lessons

Get a new lesson from me every day January 1-21! This includes 9 video lessons (closed captions included), 12 written lessons, 15 recipes (this is NOT a meal plan or food protocol, these recipes are purely for your enjoyment!), 21 daily worksheets, along with a digital gut health journal and prompts.

Structured Action Steps

This is the “challenge” part of Microbiome 21! Along with each lesson, you’ll track your progress and activities in daily worksheets (shiny, new, and upgraded for 2023). Feeling better is the best motivator to keep on track — this challenge will show you how actions turn into results!

Prep Lessons

If you don’t know your before, you can’t measure your after. Leading up to January 1, you’ll receive weekly Pre-Challenge Prep Lessons in your portal to get you ready! On December 26, you'll get access to your Pre-Challenge Workbook that includes worksheets, tracking sheets, and low-key kitchen prep. You'll also receive your shopping list, recipes and ways you can take the challenge to the next level.

Member Portal with App Access

Your member portal will contain all your lessons, training videos, worksheets, and recipes! You’ll return to it daily to complete each lesson and can even make it part of your on-the-go routine with easy app access!

Community Support

This year's community comes with an optimized experience hosted in Kajabi. You'll be able to access your challenge portal and private community within the same library, so there's no need to join any other platform. Together, every member of the community will motivate and build one another up while working through the daily lessons. I’ll be in there too, to cheer you on and answer questions!

Unlimited Access

With unlimited access, you can take the challenge any time you want. Whether you want to reset your gut, hold yourself accountable to your habits, refresh yourself on the lessons, or just miss having a daily plan — all you need to do is sign in and get started! Even if you're unable to start the challenge on January 1, enroll now for lifetime access and to begin whenever you're ready.

Challange At A Glance

Day 1: “Dr. B, how do I know if I have a healthy gut?”

Day 2: Circadian Rhythm and Gut Health (Part 1)

Day 3: Circadian Rhythm and Gut Health (Part 2)

Day 4: Quench Your Thirst and Heal Your Gut

Day 5: Plant Diversity and Understanding Plant Points

Day 6: Identifying and Understand Food Intolerance

Day 7: Mindfulness and Movement to Support Optimal Gut Health

Day 8: Setting Intentions and Preparing to Win Your Week

Day 9: Rock Your F-GOALS

Day 10: DIY Fermentation

Day 11: Choose Your Own Fermentation Adventure

Day 12: L is for Legumes

Day 13: You Make Me Wanna SPROUT!

Day 14: Fall in Love With Leafy Greens

Day 15: Recipes for a Fiber Filled Week

Day 16: Let’s Get Fiber Fueled!

Day 17: Epic Dumps and How to Have Them

Day 18: Fantastic Bowel Movements Beyond Your Diet

Day 19: Supplements for Gut Health

Day 20: What’s Happening in Your Gut Right Now?

Day 21: MAINTAINING YOUR MOMENTUM: LIVE Q&A WITH DR. B

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Optimize

Your Gut Health

This is the key to boosting our metabolism, balancing our hormones, and taming the inflammation that causes a host of diseases. Most importantly, it’s the key to feeling GOOD.

Establish

Lasting Healthy Habits

It is healthy habits that allow us to just live our routine lives and yet be promoting health and fitness. When positive habits form, effortless fitness ensues.

Learn

Exactly How to Become the Healthiest Version of You

When complex science becomes easy-to-digest, knowing how to achieve optimal health becomes accessible and understandable.

Revolutionize

The Way You Think About Nutrition

What you eat and how you think about food is about to get the engaging, evidence-based treatment. You’ll never consider a fad diet again once you know how to think about nutrition!

Reset,

Restore, and Revitalize!

You’ll come through this challenge feeling like a more energetic, confident, well-informed, and happy YOU! Remember, it’s not about resolutions, it’s about your revolution.

Change is Possible in 21 Days

“My husband and I started 2022 the best possible way by signing up for Dr. B’s 21-Day Microbiome 21 Challenge. We’ve been vegan for five years and WFPB for the past 2 ½, but after spending so much time in lockdown, we really felt we had let things slip. The booze was back, hash browns were a regular for breakfast and we were eating a lot more processed foods and oils than we had in a good while.

In short, we felt like crap.

Three weeks later, things couldn’t be more different.

No alcohol, no fizzy drinks, no processed foods. Our energy levels have gone through the roof, so has our motivation and mindset is so much more relaxed and positive.

I feel like a whole new person! I learned SO much – such as immune conditions like fibromyalgia and coeliac disease start in your GUT – and it has given me so much hope and control in recovering both from fibro AND myocarditis. We average between 35-45 plants a day and will never go back to any other way of eating.

Everything we have learned and implemented has set us up for life.

I have learned more about nutrition and what causes and heals disease in three weeks than I did in my entire Cornell Plant Based Nutrition course!”

— JACKIE

What it's like

Learning from Dr. B

Q
"I’m back on track and I love it. I do feel so much better and having accountability helps to stay on track!"
MarieMicrobiome 21
Thank you, Dr. B, for all the wisdom you imparted to us. The 21 days flew by fast! I am now a little more knowledgeable about the different types of poop! I lost 6lbs and feel great!! No bloating and no gas!! Yeah!!
LillyMicrobiome 21
Down 9lbs and 2.5 inches off my belly. Still a long way to go, but off to a great start. Every meal, I stop and ask myself if there is another plant I can add and I can usually find one or two. Sprouts are now growing and I am working on adding in fermented foods at least every other day.
LibbyMicrobiome 21
When I started Dr. B’s 21-day challenge, I was having attacks of GERD and IBS two or three times a week and felt lethargic all the time. I have now been 6 weeks without any gut issues at all! I’m now eating a completely WFPB, no oil diet. I am eating as much high FODMAP foods as I want and feel great! No symptoms whatsoever.
LindaMicrobiome 21
The challenge was worthwhile and helpful even though I’ve been plant-based for 20+ years.
KarenMicrobiome 21
I just finished watching the Day 4 video and it definitely hit home! It has never once occurred to me that such things can have that effect on our guts!
ClareMicrobiome 21

Reset Your Gut, Restore Your Health, & Revitalize Your Routine

Join The Waitlist

Class Starts January 2024
$ 37
  • Start 2024 with guidance, support, and a plan
  • Science-backed, evidence-based, and FUN challenges to establish lasting gut health, delivered daily to your inbox and your member portal
  • Recipes you won't find anywhere else, guaranteed to blow your taste buds away
  • Track your progress with daily worksheets
  • Exclusive prep lessons to set you up for the best start to the challenge
  • Gain empowerment, support, and get your questions answered in the members-only Dr. B’s Microbiome 21 Community hosted within Kajabi
  • Return to Microbiome 21 whenever you need to reset or boost your commitment with lifetime access to the lessons and exercises
  • LIVE Training + Q&A on January 21 on keeping up your momentum and furthering your personal health goals

Sign up to be the first to know when my 21-day challenge opens for enrollment again

With pre-challenge prep, 21 daily lessons (including videos, recipes, worksheets, and more), structured action steps, unlimited access and private community support — I’m here to show you exactly how to have fun while experiencing a personal health revolution!

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Hey! I'm Dr. Will Bulsiewicz, MD MSCI

(Pronounced bull-suh-wits) but you can call me Dr. B

You may know me as @TheGutHealthMD. I’m the New York Times bestselling author of the book Fiber Fueled a full-time gastroenterologist, and an internationally recognized gut health expert.

I’ve dedicated my life to learning how to heal the gut from the inside out.

I completed a bachelor’s degree from Vanderbilt University, an MD from Georgetown University, and a master’s in clinical investigation from Northwestern University.

I was also the chief medical resident at Northwestern and the chief gastroenterology fellow at UNC, and I received the highest award given by both my residency and fellowship.

I created this training because many experience constipation, but not enough folks talk about it. When we’re educated about a condition, we make the right choices — whether that means seeking the right professional to help us navigate our difficulties or making changes within our control to feel better.

I’m honored to be your teacher and I hope you enjoy the training!

FAQ

No, Microbiome 21 is not a 21-day meal plan, although you will get recipes as part of the challenge as well as a list of Dr. B’s kitchen staples. Dr. B will offer plenty of guidance on what food best supports your gut, but there’s more to a healthy gut than the food we eat!

Microbiome 21 is NOT a 21-day dietary protocol. It’s a 21-day program for leveling up your microbiome using various methods, including recipes that are flexible, accessible, and easily substituted based on your dietary preferences.

The cost to join is a one-time fee of $37. The only additional costs will be for ingredients to recipes you choose to make.

 The challenge will be hosted in a private portal on a platform called Kajabi. You’ll create a username as you complete the checkout process, and all your assets will be accessible on Kajabi’s platform or app.

When you purchase a digital gift card, you’ll receive two emails. One is a confirmation directly from Kajabi and contains the unique code tied to your gift card that will give your recipient 100% off their purchase price. The second email will come from me and will include instructions for redeeming and a gift certificate for you to fill in for your lucky someone. From there you can either print the gift certificate out and give it to them, or upload it to an email and send them their gift!

No way! This is for every person that wants to feel good, eat well, and learn more about how the gut influences the health of every bodily system.

Lesson length will vary depending on the complexity of the topic, but being able to commit at least 20 minutes a day (not counting cooking time) will serve you best.

Your daily lesson will drop into your portal at midnight eastern each and every day starting January 1, 2023! I’ll send you an email each day with an intro and preview of the lesson and link to access your portal, just in case you need it.

Due to the nature of digital content, there are no refunds for Microbiome 21. Dr. B stands by this product 100%.

You get unlimited on-demand access to the training and accompanying assets in your portal. However, it’s important to remember that health information can change as researchers learn more over time. Therefore, the information you learn in Microbiome 21 has the potential to change alongside new scientific evidence.

This content is provided as education and does not replace the need for having a local healthcare provider to support you and provide personalized medical advice. Dr. Bulsiewicz will not be giving personalized medical advice and purchasing Microbiome 21 does not make him your doctor in any form. His goal is to empower you with the proper education so that you can accomplish your health goals with the support of local health providers as needed.

Still have questions? Email Support@theplantfedgut.com

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Let's Connect

© 2025 Will Bulsiewicz and Dr. B Gut Health LLC