Your Doctor Is Treating the Wrong Organ

The Night I Realized I'd Made Everything Worse

If you're going 3, 4, even 5 days between bowel movements since you started Ozempic®, Wegovy®, Mounjaro® or Zepbound®, your doctor is treating the wrong organ.

I shouldn't have to write that sentence. The motility research has existed for over a decade. Every gastroenterologist in America should already know it.

But the standard constipation protocol predates GLP-1 medications by 40 years. Most doctors are still running the old playbook on a problem the old playbook can't solve.

I'm one of those doctors.

I missed it for 15 years before I caught it. And by the time I caught it, I'd already prescribed the wrong thing to hundreds of women who walked out of my office trusting me.

I'm writing this because I owe somebody an honest accounting of that.

My name is Dr. Rebecca Marsh. I'm a gastroenterologist. I've spent 18 years specializing in gut motility disorders.

For the last three years, I've been telling every one of my GLP-1 patients the same thing I'm about to tell you. And in the last six months, I've started telling friends, family, my own mother — anyone who would listen.

If you'll hear me out, I can explain something the doctor who wrote your prescription almost certainly didn't. Something every online article, every Reddit thread, and every "have you tried more fiber" comment has missed completely.

If you've started skipping breakfast because anything you eat just sits there...
If you've started keeping an elastic pair of jeans in your car because by 5pm the regular pair won't button...
If you've been standing in front of the medicine cabinet at 9pm rationing Miralax because you're afraid of needing it on a day you actually have plans...

The next 12 minutes could change the next 12 months.

What I Learned in the Three Weeks That Followed

It was a Tuesday in February. 6:47 PM.

My last patient of the day was a 64-year-old woman. She had been on Mounjaro® for nine months. Forty-seven pounds down. The kind of result every endocrinologist dreams of.

She sat across from me, opened her purse, and pulled out a single piece of paper. Folded twice.

"I wrote my resignation," she said.

Not from a job. From the medication.

She had typed it the night before. Printed it. Left it on her kitchen counter, ready to bring to her endocrinologist appointment the following Tuesday. She was about to throw away every pound of weight loss because she hadn't passed anything in six days and couldn't sit through a board meeting without standing up halfway through.

I had been her gastroenterologist for the entire nine months.

I had given her every single piece of advice in the standard motility protocol.

More fiber. More water. More vegetables. Try Miralax. Try magnesium citrate. Add a probiotic. Switch the probiotic. Try psyllium husk. Try a stool softener at night.

Three-ring binder of tracking notes on her phone. Receipts from CVS. Spreadsheets marked "fiber," "magnesium," "Miralax." Twelve hundred dollars a month at her worst.

Nothing worked. Not one thing.

I drove home that night and didn't sleep. Two in the morning I was at the kitchen table with my laptop and a legal pad. The question I couldn't stop asking was: how many of them have I done this to?

The Part That Should Make You Furious

I started reading. For weeks. Then months. Pulling research that wasn't in the standard motility curriculum because the standard motility curriculum predates these medications by 40 years.

Here's what I learned. And I want to be honest about how angry it made me.

GLP-1 medications work by slowing your stomach down. That isn't a side effect. That's the medication doing exactly what it was designed to do — holding food longer so you feel full on less. The weight loss depends on that slowdown.

But your stomach is now emptying at a fraction of the speed it used to. Food that would normally leave in 2 hours is sitting there for 5, 6, sometimes 8. Every meal sits on top of the meal before it. Nothing moves through. Everything builds up.

This has a clinical name: Drug-induced gastroparesis. Slowed stomach.

Every gastroenterologist in this country knows what gastroparesis is. We learned about it in medical school. We have a protocol for it.

But almost none of us are calling GLP-1 constipation what it actually is. We're calling it constipation, and we're treating it like constipation.

Constipation is a colon problem. Gastroparesis is a stomach problem. There are six feet of intestine between those two organs.

Your colon is fine. Your colon has been fine the whole time.

The blockage is six feet upstream. In your stomach. And every product your doctor has handed you for the last six months has been pointed at the wrong organ.

Two Women, Same Dose, Different Stories

Miralax pulls water into your colon to soften stool. But there's barely any stool in your colon to soften — the food is still trapped in your stomach. So you're hydrating an empty pipe. Designed to be taken daily. Forever. Customer for life.

Dulcolax and senna trigger contractions in the colon wall. But there's nothing in the colon to push. So your colon contracts around empty space, gives you cramps, and produces nothing. That's why it's worse the second time you try it.

Magnesium citrate does the same thing as Miralax — pulls water into the lower intestine. Same organ. Same wrong organ. Bigger bottle. Different label.

Probiotics seed beneficial bacteria into a section of the gut that isn't the section that's broken. Even when they work as advertised, they're working downstream of the actual problem. $40–$70 a month for an indefinite subscription.

Fiber is the cruelest one. Psyllium, Metamucil, fiber gummies, leafy greens, the extra serving of vegetables your doctor told you to add. Every one of them is food. Adding fiber to a stalled stomach just adds to what's already sitting there. The bulk-forming fiber actively makes the bloating worse, because now there's more volume in a tank that already isn't draining.

The "more fiber" advice isn't slightly off. It's pointed in exactly the wrong direction.

You weren't failing the protocol. The protocol was wrong for you.

You're not lazy. You're not undisciplined. You didn't "try the wrong brand."

You were handed five products that all work on the same organ — and the organ they work on isn't the one that's broken.

Add it up. The Miralax. The fiber. The magnesium. The probiotics. The "GLP-1 gut support" thing your friend recommended. The Amazon supplement with the big claims and the small print. For most of my patients it's $300–$500 a month. For my worst patients it's been over a thousand. For years. And every dollar of it spent six feet away from where the actual problem lives.

The Protocol That's Been Sitting in the Research for Years

Here's what I want you to understand before we go any further.

Two women walk into my clinic. Same age. Same starting weight. Same 5mg Mounjaro® dose. Started the same week.

Six months later, one is regular as a clock. The other hasn't gone in six days.

The difference isn't the drug. The difference is how badly each individual stomach got slowed and what was already sitting in there when the medication kicked in.

That's why your friend on Wegovy® is fine and you're a wreck.

You're not broken. You're not deficient. You're not a "non-responder."

You happen to have the version that needs the upstream fix.

Most doctors don't tell their patients this because most doctors don't know it. They prescribe the GLP-1, hand out the standard fiber protocol, and assume that the patients who keep coming back complaining are doing something wrong on their end.

I assumed it for 15 years. I owe a lot of women an apology I'll never get to deliver.

Then I Found a Small Company Called Motilli

What the Wake-Up Looks Like

I've seen the same change in dozens of patients now.

The 57-year-old whose husband had moved into the guest bedroom because the gas at night was unbearable. Four weeks after she started, she texted my office: "He's back in our bed. I don't know how to thank you."

The 52-year-old who kept two pairs of jeans in her car — the regular pair for morning, the elastic pair she changed into in the parking lot before dinner. She sent the elastic pair to Goodwill.

The 61-year-old who'd bought a dress for her son's wedding eight months earlier and never worn it. She wore it.

The patient who came in last week and told me, "I was at my granddaughter's birthday party on Saturday. I sat through the whole thing. I had cake. I drove home. I went to bed. I didn't think about my stomach once. I haven't been able to say that since 2024."

Most of my patients have their first easy, unassisted bowel movement within 10 to 14 days. Many within the first week.

Why I'm Writing This, Instead of Just Telling My Patients

Here's the part I want you to actually picture.

You'll have a morning, somewhere between week two and week six, where you wake up and realize something strange.

You didn't do the math.

You didn't try to remember the last time you went. You didn't stand sideways in the mirror to check the bloat. You didn't pick out the elastic pants from the back of the closet "just in case."

You didn't open the medicine cabinet to ration the Miralax.

You woke up. You drank coffee. You had breakfast. You went to work.

And somewhere around 11am you noticed you hadn't thought about your stomach all morning.

That's what the women I've been treating get back. Not "regularity." Not "less bloating."

Their attention. The space in their head that the suffering had been renting for free.