What If IBS Has an Unexpected Root Cause?

Discover the 5-Shift System that enabled a Silicon Valley CEO to eliminate 9 years of severe IBS—and why hundreds of others are finding relief when conventional treatments fail.

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Free 22-Minute IBS Masterclass Learn why the root cause of IBS may not be what healthcare professionals think—and why the most effective approach may be surprising.

Does This Sound Familiar?

  • Planning every day around bathroom access?

  • Turning down invitations out of fear?

  • Living on restrictive diets that barely help
?
  • Doctors saying "We don't know the cause"?

  • Trying medications, supplements, probiotics—nothing really works?

  • Feeling like you'll be stuck with this for the rest of your life?

Millions have IBS. Few find a satisfactory solution.
It's not their fault. They just didn't have an approach that addresses the actual root cause.

I Know the Feeling, Exactly

 

I'm Guy Downing, a Silicon Valley CEO with an MBA from a top-tier business school.

For 9 years, I had severe IBS. I saw 9 doctors, including the 3 top IBS specialists in the San Francisco Bay Area. I tried every medication and diet they recommended. I followed the Low FODMAP for 2 years. I spent a ton of money on doctors’ appointments, alternative medicine treatments, expensive prescription medications, supplements, probiotics, and special foods.

Nothing worked.

I developed a System, which I share in our IBS Masterclass and them I applied the System.

8 weeks later, my symptoms were gone! That was years ago. I still eat whatever I want. No bathroom dramas. I got my life back.

About Guy Downing

Silicon Valley CEO & Executive Director of ReThink Disease

  •  Top-tier MBA from leading business school.
  • Managed multiple companies and raised nearly $200 million in startup funding.
  • Decades of studying and training in psychology and personal growth.
  • Healed himself of 9 years of severe IBS in 8 weeks.
  • Healed himself of  14 years of Multiple Chemical Sensitivities (MCS) in 30 days.
  • Founded ReThink Research, a 501(c)(3) nonprofit organization.
  • Taught these principles to 100's of people worldwide.

Guy's Mission: To honor 5 mentors who transformed his life by helping others heal themselves from conditions conventional medicine calls 'incurable.'

Besides decades of experience as a CEO in Silicon Valley, Guy earned an AB from UC Berkeley and an MBA from The Wharton School at the University of Pennsylvania. ReThink was developed with support from Y Combinator, the well-known startup incubator. The IRS granted ReThink 501(c)(3) nonprofit status.

Here's What Most Don't Know About IBS...

IBS has medical symptoms, but the root cause isn't medical... at all.
It's in a completely different field of knowledge—one doctors aren't trained in.
That's why:

  • Medications only mask symptoms temporarily.
  • Diets provide minimal, if any relief.
  • Symptoms persist no matter what.

Once you understand the actual IBS mechanism, everything changes.

Discover in Free 25-minute IBS Masterclass...

  • The actual root cause of IBS. (It's not what doctors think.)
  • Why medications and diets fall short. (What works instead.)
  • The complete 5-Shift System I used to eliminate my severe IBS symptoms in 8 weeks.
  • How 100's of folks with moderate to severe IBS found relief using these same principles.
  • Why conventional approaches focus on the wrong area—and what to focus on instead.
  • How to start addressing IBS symptoms today—without restrictive diets or medications.

This Approach Has Helped 100's Find Relief.

Ready to Learn More?

  Watch Free IBS Masterclass  

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Just 25 minutes that could change everything.

"More than anyone or anything else, the principles and tools you've taught me have transformed the quality of my life, including my health, and my relationships with others. Thank you, Guy."
– Mimi Mugler, Berkeley, California

"I don’t know that I would be the same person, my physical well being,  that I am today without the tools you have taught me and the ongoing support. Thank you."
– Nalini Sankar, Mountain View, California 

This Approach Has Helped 100's Find Relief.

People who suffered for years—even decades—are now:

  • Eating foods they love without fear.
  • Traveling without bathroom anxiety.
  • Accepting social invitations confidently.
  • Living with restored energy and freedom.
  • Many are completely symptom-free.

This isn't about "managing symptoms for the rest of one’s life." This is about addressing the root cause and getting one’s life back.

The 5-Shift ReThink System

Shift #1: Shifting specific, critical mindsets and taking ownership of one’ health.
Step #2: Coming to understand what's actually causing IBS symptoms. (It’s not food.)
Step #3: Learning specific ReThink Tools and Practices to address the actual mechanism.
Step #4: Learning how to re-engage with life, food, and activities without symptoms.

Why This Works When Everything Else Fails

Conventional Treatments

  • Focus on diet and medications.
  • Only manages symptoms.
  • Most report symptons persist.
  • Leaves one stuck for life.

ReThink 5-Shift System

  • Addresses the root cause.
  • No restrictive diets.
  • No medications or supplements.
  • Track record with 100's of people.

Who is This IBS Masterclass For?

    This IS for folks who:

  • Have moderate to severe IBS.
    (Ideally diagnosed by a medical doctor.)
  • Have tried medications, diets, or supplements without relief.
  • Are open to a completely different perspective.
  • Are willing to invest time and effort to address the root cause.
  • Are serious about finding real relief—not just "managing" symptoms.

   This is NOT for folks who:

  • Are looking for a quick fix or a magic pill.
  • Are not open to challenging conventional thinking.
  • Who are closed-minded to new ideas.
  • Are not willing to do the work.

After Watching the IBS Masterclass

Stick around for personalized guidance on applying this approach to a specific situation, there'll be an opportunity to reserve a free consultation call.
On this call, we'll:

  • Answer any questions and review specific symptoms, triggers, and IBS history.
  • Get clarity on the disease.
  • Create a free personalized healing plan, a healing roadmap.
  • Explore how we can help. (If it's mutually a good fit.)

No pressure. No obligation. Just clarity on next steps. We are here to serve.

Frequently Asked Questions

Q: Is this just another diet, supplement, or medication approach?
A: No. This addresses the root cause, which isn't about food or medications.

Q: Will this work for me if I've tried everything?
A: Many who've found relief with this approach had tried everything else first. Watch the IBS Masterclass. See how it resonates.

Q: How long does it take to see results?
A: Everyone is different, but many people see meaningful improvement within 8 weeks. 

Q: Do I need to follow a restrictive diet?
A: No. This approach doesn't require special foods.

Q: Is this scientifically proven?
A: Yes. The ReThink System is based on established psychological and neurological science. Hundreds have used this approach successfully. However, our work has not been evaluated by the FDA. Please see Disclaimer below.

Q: What's the tuition?
A: The IBS Masterclass is completely free. If you'd like personalized support through our online program, after the call we can discuss options then.

Q: Do I need to stop seeing my doctor?
A: Absolutely not. This approach is complementary with medical treatments, not a replacement for medical care.

Last Chance for FREE IBS Masterclass

  Watch Free IBS Masterclass  

Get instant access. No credit card. No obligation.
Just 25 minutes that could change everything.

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