It takes a long time for some patients with obesity to acknowledge that they need help, said Dr. Laster, a bariatric endoscopist who specializes in gastroenterology, nutrition, and obesity medicine at Gut Theory Total Digestive Care, and Georgetown University Hospital in Washington. “If somebody has high blood pressure or has a cut or has chest pain, you don’t wait for things. You would go seek help immediately. I wish more patients reached out sooner and didn’t struggle.”
Another big challenge is making sure patients have insurance coverage for things like medications, surgery, and bariatric endoscopy, she added.
Her response: education and advocacy. “I’m giving as many talks as I can to fellows, creating courses for residents and fellows and medical students” to change the way physicians talk about obesity and excess weight, she said. Patients need to understand that physicians care about them, that “we’re not judging and we’re changing that perspective.”
Dr. Laster is also working with members of Congress to get bills passed for coverage of obesity medication and procedures. In an interview with GI & Hepatology News, she spoke more about the intersection between nutrition, medicine and bariatric procedures and the importance of offering patients multiple solutions.
Q: Why did you choose GI?
It allowed me a little bit of everything. You have clinic, where you can really interact with patients and get to the root of their problem. You have preventative care with routine colonoscopies and upper endoscopies to prevent for cancer. But then you also have fun stuff — which my mom told me to stop saying out loud — ‘bleeders’ and acute things that you get to fix immediately. So, you get the adrenaline rush too. I like it because you get the best of all worlds and it’s really hard to get bored.
Q: How did you become interested in nutrition and bariatric endoscopy?
My parents had a garden and never let us eat processed foods. In residency, I kept seeing the same medical problems over and over again. Everybody had high blood pressure, high cholesterol, and diabetes. Then in GI clinic, everybody had abdominal pain, bloating, constipation, heartburn, and a million GI appointments for these same things. Everyone’s upper endoscopy or colonoscopy was negative. Something else had to be going on.
And that’s sort of where it came from; figuring out the common denominator. It had to be what people were eating. There’s also the prevalence of patients with obesity going up every single year. Correlating all these other medical problems with people’s diets led me down the rabbit hole of: What else can we be doing?
Most people don’t want to undergo surgery. Only 2% of people eligible for surgery actually do it, even though it works. The reasons are because it’s invasive or there’s shame behind it. Bariatric endoscopy is another option that’s out here, that’s less invasive. I’m an endoscopist and gastroenterologist. I should be able to offer all those things and I should know more about nutrition. We don’t talk about it enough.
Q: Do you think more GI doctors should become better educated about nutrition?
100%. Every patient I see has seen a GI doctor before and says, ‘No one has ever told me that if I have carbonated beverages and cheese every day, I’m going to be bloated and constipated.’ And that shouldn’t be the case.
Q: Why do you think that more GI doctors don’t get the education on nutrition during their medical training?
I think it’s our healthcare system. It’s very much focused on secondary treatment rather than preventative care. There’s no emphasis on preventing things from happening.
We’re really good at reactionary medicine. People who have an ulcer, big polyps and colon cancer, esophageal cancer — we do those things really well. But I think because there’s no ICD-10 codes for preventive care via nutrition education, and no good reimbursement, then there’s no incentive for hospital systems to pay for these things. It’s a system based on RVUs (relative value units) and numbers. That’s been our trajectory. We’ve been so focused on reactionary medicine rather than saying, ‘Okay, let’s stop this from happening.’
We just didn’t talk about nutrition in medical school, in residency, or in fellowship. It was looked at as a soft science. When I was in school, people would also say, ‘No one’s going to change. So it’s a waste of your time essentially to talk to people about making dietary changes.’ I feel like if you give people the opportunity, you have to give them the chance. You can’t just write everybody off. Some people won’t change, but that’s okay. They should at least have the opportunity to do so.
Q: How do you determine whether a patient is a good candidate for bariatric surgery?
It’s based on the guidelines: If they meet the BMI requirements, if they have obesity-associated comorbidities, their risk for surgery is low. But it’s also whether they want to do it or not. A patient has to be in the mindset and be ready for it. They need to want to have surgery or bariatric endoscopy, or to use medications, or start to make a change. Some people aren’t there yet — that preemptive stage of making a change. They want the solution, but they’re not ready to do that legwork yet.
And all of it is work. I tell patients, ‘Whether it’s medication or bariatric endoscopy or bariatric surgery, you still have work to do. None of it is going to just magically happen where you could just continue to do the same thing you’re doing now and you’re going to lose weight and keep it off.’
Q: What advances in obesity prevention are you excited about?
I’m excited that bariatric endoscopy came about in the first place, because in every other field there are less invasive approaches that have become available. I’m also excited about the emergence of weight loss medication, like GLP-1s. I think they are a tool that we need.
Q: Do you think the weight loss medications may negate the need for surgery?
I don’t think they necessarily reduce the need for surgery. There’s still a lot we don’t know about why they work in some patients and why they don’t work in others.
Some of our colleagues have come up with phenotypes and blood tests so we can better understand which things will work in different patients. Surgery doesn’t work for some patients. People may need a combination of both after they reach a plateau. I’m excited that people see this as something that we should be researching and putting more effort into — that obesity isn’t a disease of moral failure, that people with excess weight just need to ‘move more’ or ‘eat less’ and it’s their fault. I’m glad people are starting to understand that.
Q: What teacher or mentor had the greatest impact on you?
Probably two. One of them is Andrea E Reid, MD, MPH, a dean of medicine at Harvard. She gives you such motivation to achieve things, no matter how big your idea is or how crazy it may seem. If you have something that you think is important, you go after it. Another person is Christopher C. Thompson, MD, at Brigham and Women’s Hospital, the father of bariatric endoscopy in a sense. He embodies what Dr. Reid talks about: crazy big ideas. And he goes after them and he succeeds. Having him push me and giving me that type of encouragement was invaluable.
Q: Describe how you would spend a free Saturday afternoon.
Every Saturday is yoga or some type of movement. Spending some time outside doing something, whether it’s messing around with plants that I’m not very good at, or going for a walk.
Lightning Round
Texting or talking?
Text
Favorite city in U.S. besides the one you live in?
New York
Favorite breakfast?
Avocado toast
Place you most want to travel to?
Istanbul
Favorite season?
Fall
Favorite ice cream flavor?
Raspberry sorbet
How many cups of coffee do you drink per day?
One
Best place you ever went on vacation?
Greece
If you weren’t a gastroenterologist, what would you be?
Own a clothing store
Favorite type of music?
Old school R&B
Favorite movie genre?
Romantic comedy or drama
Cat person or dog person?
Dog
Favorite sport?
Football
Favorite holiday?
Christmas
Optimist or pessimist?
Optimist
Summary content
7 Key Takeaways
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1
Developed a paper-based colorimetric sensor array for chemical threat detection.
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Can detect 12 chemical agents, including industrial toxins.
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Production cost is under 20 cents per chip.
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Utilizes dye-loaded silica particles on self-adhesive paper.
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5
Provides rapid, simultaneous identification through image analysis.
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Inspired by the mammalian olfactory system for pattern recognition.
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Future developments include a machine learning-enabled reader device.
The guidelines emphasize four-hour gastric emptying studies over two-hour testing. How do you see this affecting diagnostic workflows in practice?
Dr. Staller: Moving to a four-hour solid-meal scintigraphy will actually simplify decision-making. The two-hour reads miss a meaningful proportion of delayed emptying; standardizing on four hours reduces false negatives and the “maybe gastroparesis” purgatory that leads to repeat testing. Practically, it means closer coordination with nuclear medicine (longer slots, consistent standardized meal), updating order sets to default to a four-hour protocol, and educating front-line teams so patients arrive appropriately prepped. The payoff is fewer equivocal studies and more confident treatment plans.
Metoclopramide and erythromycin are the only agents conditionally recommended for initial therapy. How does this align with what is being currently prescribed?
Dr. Staller: This largely mirrors real-world practice. Metoclopramide remains the only FDA-approved prokinetic for gastroparesis, and short “pulsed” erythromycin courses are familiar to many of us—recognizing tachyphylaxis limits durability. Our recommendation is “conditional” because the underlying evidence is modest and patient responses are heterogeneous, but it formalizes what many clinicians already do: start with metoclopramide (lowest effective dose, limited duration, counsel on neurologic adverse effects) and reserve erythromycin for targeted use (exacerbations, bridging).
Several agents, including domperidone and prucalopride, received recommendations against first-line use. How will that influence discussions with patients who ask about these therapies?
Dr. Staller: Two points I share with patients: evidence and access/safety. For domperidone, the data quality is mixed, and US access is through an FDA IND mechanism; you’re committing patients to EKG monitoring and a non-trivial administrative lift. For prucalopride, the gastroparesis-specific evidence isn’t strong enough yet to justify first-line use. So, our stance is not “never,” it’s just “not first.” If someone fails or cannot tolerate initial therapy, we can revisit these options through shared decision-making, setting expectations about benefit, monitoring, and off-label use. The guideline language helps clinicians have a transparent, evidence-based conversation at the first visit.
The guidelines suggest reserving procedures like G-POEM and gastric electrical stimulation for refractory cases. In your practice, how do you decide when a patient is “refractory” to medical therapy?
Dr. Staller: I define “refractory” with three anchors.
1. Adequate trials of foundational care: dietary optimization and glycemic control; an antiemetic; and at least one prokinetic at appropriate dose/duration (with intolerance documented if stopped early).
2. Persistent, function-limiting symptoms: ongoing nausea/vomiting, weight loss, dehydration, ER visits/hospitalizations, or malnutrition despite the above—ideally tracked with a validated instrument (e.g., GCSI) plus nutritional metrics.
3. Objective correlation: delayed emptying on a standardized 4-hour solid-meal study that aligns with the clinical picture (and medications that slow emptying addressed).
At that point, referral to a center with procedural expertise for G-POEM or consideration of gastric electrical stimulation becomes appropriate, with multidisciplinary evaluation (GI, nutrition, psychology, and, when needed, surgery).
What role do you see dietary modification and glycemic control playing alongside pharmacologic therapy in light of these recommendations?
Dr. Staller: They’re the bedrock. A small-particle, lower-fat, calorie-dense diet—often leaning on nutrient-rich liquids—can meaningfully reduce symptom burden. Partnering with dietitians early pays dividends. For diabetes, tighter glycemic control can improve gastric emptying and symptoms; I explicitly review medications that can slow emptying (e.g., opioids; consider timing/necessity of GLP-1 receptor agonists) and encourage continuous glucose monitor-informed adjustments. Pharmacotherapy sits on top of those pillars; without them, medications will likely underperform.
The guideline notes “considerable unmet need” in gastroparesis treatment. Where do you think future therapies or research are most urgently needed?
Dr. Staller: I see three major areas.
1. Truly durable prokinetics: agents that improve emptying and symptoms over months, with better safety than legacy options (e.g., next-gen motilin/ghrelin agonists, better-studied 5-HT4 strategies).
2. Endotyping and biomarkers: we need to stop treating all gastroparesis as one disease. Clinical, physiologic, and microbiome/omic signatures that predict who benefits from which therapy (drug vs G-POEM vs GES) would transform care.
3. Patient-centered trials: larger, longer RCTs that prioritize validated symptom and quality-of-life outcomes, include nutritional endpoints, and reflect real-world medication confounders.
Our guideline intentionally highlights these gaps to hopefully catalyze better trials and smarter referral pathways.
Dr. Staller is with the Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston.