Diet Coke for Bezoars: What Ozempic Users Need to Know

When a Stomach Mass Dissolved Overnight With Diet Coke

You may have seen the headline and done a double take. A woman taking Ozempic (semaglutide) developed a hardened mass in her stomach. Her doctors prescribed 1.5 liters of Diet Coke. By the next day, the mass was gone.

It sounds like something out of a folk remedy forum, but this is an established medical technique with peer-reviewed backing. And for anyone currently taking a GLP-1 medication, the underlying story is worth understanding in full.

What Is a Bezoar, and Why Does It Matter for GLP-1 Users?

A bezoar is a compacted mass of undigested material that accumulates in the stomach or digestive tract. The word sounds archaic because it is. Bezoars were once thought to have mystical healing powers and were worn as pendants in medieval Europe. Today, they're a documented medical condition.

Types of Bezoars

There are several types, but the most common in modern patients is the phytobezoar, made of plant fiber, skins, and other indigestible food material. These are most likely to form in people with delayed gastric emptying, a condition where the stomach moves food into the small intestine more slowly than normal.

Other types include:

• Trichobezoars: Made of hair, more common in children or people with certain psychological conditions
• Pharmacobezoars: Made of medication, particularly slow-release capsules
• Lactobezoars: Seen in premature infants fed certain formulas

For GLP-1 users, the phytobezoar is the relevant concern.

The GLP-1 Connection: Slowed Stomach Emptying

Ozempic, Wegovy, and Mounjaro all work partly by slowing gastric emptying. This is actually a feature, not a bug. Slower digestion means food stays in your stomach longer, you feel full sooner, and you eat less. That's a core mechanism behind their effectiveness for weight loss and blood sugar control.

But like most drug mechanisms, slowing the stomach comes with a spectrum of effects. On the mild end, it causes the nausea and early fullness that many GLP-1 users experience, especially in the first few weeks. On the more extreme end, in a small number of patients, it can contribute to a condition called gastroparesis, where the stomach empties so slowly that food essentially stagnates.

Gastroparesis vs. Normal GLP-1 Side Effects

Gastroparesis is a formal diagnosis, not just a rough stomach. It involves nerve or muscle damage to the stomach that prevents it from functioning normally. GLP-1 medications don't cause structural gastroparesis in the way that, say, uncontrolled diabetes can over decades. But they can produce gastroparesis-like symptoms, and in patients who already have underlying motility issues, they may worsen them.

A stomach that empties slowly is a stomach more vulnerable to bezoar formation, particularly if someone eats fibrous foods, doesn't chew thoroughly, or has other risk factors like previous stomach surgery.

Why Diet Coke Works as a Medical Treatment

This is where the story gets genuinely interesting. Using carbonated cola beverages to dissolve phytobezoars is not a new or experimental idea. It's been published in the medical literature since at least the early 2000s and is used in gastroenterology as a first-line conservative approach before more invasive interventions.

The mechanism involves two properties of Diet Coke (and regular cola):

• Carbonic acid: The carbonation creates carbonic acid, which has a low enough pH to soften and break down the fibrous structure of plant-based bezoars.
• Sodium bicarbonate: Cola also contains compounds that create carbon dioxide gas within the stomach, physically helping to fragment and dislodge the mass.

Studies have shown dissolution rates as high as 90-93% for phytobezoars treated with cola, either alone or in combination with endoscopic intervention. Diet Coke is used because it avoids the sugar load of regular cola, which matters for diabetic patients, and many people on semaglutide are managing type 2 diabetes.

The typical protocol involves drinking cola over several hours or, in hospital settings, delivering it through a nasogastric tube directly into the stomach. In this patient's case, 1.5 liters over the course of treatment was enough to dissolve the mass entirely by the following day.

How Common Is This Risk for GLP-1 Users?

Here's the honest answer: bezoar formation in GLP-1 users is rare. There is no large-scale epidemiological data showing a spike in bezoar cases tied directly to semaglutide or tirzepatide use. But the mechanistic link is logical and has been flagged in case reports and clinical commentary.

What is more clearly documented is that GLP-1 medications can cause significant gastrointestinal slowing in a subset of patients. A 2023 study in JAMA raised concerns about GLP-1 use and rates of gastroparesis-related diagnoses, finding a statistically higher association compared to other weight loss medications. The FDA has also received adverse event reports linking semaglutide to severe gastroparesis.

The risk appears to be higher in patients who:

• Have pre-existing digestive motility issues
• Have a history of gastric bypass or other stomach surgeries
• Eat large amounts of high-fiber or fibrous foods without adequate fluid
• Are on higher doses of GLP-1 medications
• Have poorly controlled or long-standing type 2 diabetes

If you fall into any of these categories, this is a conversation to have with your prescribing provider.

Symptoms That Should Prompt a Call to Your Doctor

Most GLP-1 users will never encounter this problem. But knowing the warning signs is important, because a bezoar that goes unaddressed can lead to serious complications including obstruction, ulceration, and in rare cases, perforation of the stomach wall.

Contact your doctor if you experience any of the following while on a GLP-1 medication:

• Nausea or vomiting that persists beyond the first few weeks of a dose
• Vomiting food that was eaten hours earlier and appears largely undigested
• A persistent feeling of fullness even when you haven't eaten recently
• Stomach pain, particularly if it's localized or worsening
• Unexplained weight loss beyond what you'd expect from the medication's appetite effects
• Bloating that doesn't resolve

These symptoms don't automatically mean you have a bezoar. They could indicate a range of GI issues. But they all warrant evaluation, not watchful waiting.

What to Eat (and Avoid) on GLP-1 Medications

One of the most practical things you can do to reduce your risk is pay attention to what you eat. Because your stomach empties more slowly on these medications, certain foods carry more risk than they would otherwise.

Foods to Be Cautious About

This doesn't mean you need to avoid fruits and vegetables entirely. It means chewing thoroughly, eating moderate portions, staying hydrated, and avoiding eating large amounts of these foods in one sitting.

Practical Habits That Help

• Chew food slowly and completely before swallowing
• Avoid eating right before lying down
• Stay well hydrated throughout the day
• Eat smaller meals more frequently rather than large meals
• Avoid eating foods known to be difficult to digest right before bed

These habits align with the general dietary guidance given to GLP-1 users anyway, but they take on extra importance in light of this case.

Questions to Ask Your GLP-1 Provider

If this story has you thinking, that's a good instinct. Here are specific questions worth raising at your next appointment or telehealth visit:

• Do I have any pre-existing conditions that might make gastroparesis-like symptoms more likely for me?
• Are there dietary restrictions I should follow given how this medication affects my digestion?
• At what point should I call you versus going to urgent care if I have GI symptoms?
• If I experience persistent nausea or vomiting, is that a reason to adjust my dose?
• Should I avoid any specific foods or supplements while on this medication?

A good provider will welcome these questions. If you're still looking for a provider who takes a thorough, personalized approach to GLP-1 prescribing, you can compare options through GLP-1.com's provider directory.

The Bottom Line for GLP-1 Users

The story of a woman whose stomach mass dissolved overnight with Diet Coke is unusual enough to grab headlines, but it points to something that deserves more serious attention from anyone on a GLP-1 medication.

Slowed gastric emptying is not a theoretical side effect. It is the same mechanism that makes these drugs work, and in some patients, it can tip into territory that causes real problems. Bezoars are an extreme outcome, and a rare one. But the digestive symptoms that lead to them, nausea, early fullness, bloating, vomiting, are reported by a meaningful number of GLP-1 users.

What You Can Do Right Now

You don't need to panic or stop your medication. What you should do is take your gut health seriously while on these drugs.

Eat smaller meals. Chew thoroughly. Stay hydrated. Avoid eating very large quantities of hard-to-digest fibrous foods in one sitting. And if you notice symptoms that feel like more than standard GLP-1 adjustment nausea, talk to your doctor before assuming it will pass on its own.

The fact that 1.5 liters of Diet Coke dissolved this patient's bezoar before any surgical intervention was needed is actually a positive story about early recognition and intervention. Her care team caught it, treated it, and she recovered. That outcome is available to you too, if you pay attention and communicate with your provider.

Making Sure You Have the Right Provider

Part of being safe on GLP-1 medications is having a provider who monitors you closely, not just writes the prescription and disappears. If you're currently being prescribed through a telehealth platform and you feel like you're not getting enough individualized guidance, it may be worth comparing your options.

GLP-1.com makes it easy to find and compare providers who specialize in GLP-1 prescribing, offer ongoing monitoring, and can work with you on both the benefits and the risks. You can explore top-rated GLP-1 providers and also check the GLP-1 Coupons page if cost is a factor in your care decisions.

These medications can offer meaningful, lasting benefits for the right patients. Understanding both what they do well and what to watch out for puts you in a much better position to use them safely.