It Has To Be Me Episode

The Low FODMAP Diet

Meghan Donnelly, MS, RDN, CDN

Episode #78: October 30th, 2025

THE GOLD FROM THIS EPISODE

“FODMAPs is an acronym for fermentable oligosaccharides, disaccharides, monosaccharides, and polyols. These short-chain carbohydrates draw water and gas into the intestines, are poorly absorbed, and can cause gas, bloating, abdominal pain, and changes in bowel movements.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“The Low FODMAP Diet is a therapeutic protocol for people with digestive distress. It is the most effective, evidence-based dietary intervention for IBS with 50 to 80% of people experiencing a reduction in symptoms.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“Irritable Bowel Syndrome (IBS) is a disorder characterized by altered bowel movements, abdominal pain, gas, and bloating. There is no diagnostic marker for IBS. Doctors make a diagnosis based on symptoms with diet and stress being the primary triggers. 10 to 15% of the population suffer with the condition.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“In addition to IBS, research the Low FODMAP Diet can be a short-term strategy for managing symptoms in people with IBD, SIBO, ongoing bloating, or endometriosis. The protocol is not a treatment for these conditions.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“With the Low FODMAP Diet, it’s important to get evidence-based guidance. Many people are implementing the protocol the wrong way or it is not appropriate for them. The Monash FODMAP Diet app has a healthcare provider database to find a certified practitioner.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“The FODMAP’s protocol is a three-step process—elimination, reintroduction, and personalization. We start with the elimination phase for 2 to 6 weeks to calm inflammation and reduce symptoms in your gut. This temporary phase is restrictive and should not be extended to avoid nutritional deficiencies and disordered eating.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“The reintroduction phase is a slow and methodical process and typically lasts 3 to 6 months. We test each FODMAP category separately, challenging foods three times to monitor symptoms. Portion sizes determine tolerance thresholds.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“With the personalization phase of the protocol, we figure out how to minimize the effects of trigger foods, find substitutions, focus on stress management, and develop a way of eating that is sustainable and joyful.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“There’s a lot of misinformation and outdated data about the Low FODMAP Diet. The most reliable source is the Monash FODMAP Diet app that gets updated regularly in consultation with doctors and dietitians.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“The Low FODMAP Diet is very restrictive and can lead to gut microbiome changes, nutrient deficiencies, development of food fears or disordered eating, and social isolation. Work with a certified practitioner to avoid these things.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“FODMAP sensitivities can change. Foodborne illnesses, stressful events, or hormonal changes often trigger changes.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

“One of the most common misconceptions of the Low FODMAP Diet is that it’s a forever diet. The goal is to find your triggers and then liberalize the diet to avoid nutrient deficiencies and experience more joy with food.”

Meghan Donnelly, MS, RDN, CDN

Monash-University-Certified FODMAP Dietitian

in THIS EPISODE

  • Struggling with gas, bloating, stomach cramps, IBS, IBD, or SIBO? Meghan Donnelly—dietitian and certified FODMAP practitioner—lays out in detail how the Low FODMAP Diet can help manage symptoms.

  • We start with the basics: what FODMAPs are, why these carbohydrates are difficult to digest, and the common foods that can aggravate digestive distress.

  • From there, Meghan outlines how Monash University developed the FODMAP protocol and the go-to app. Then walks us through the protocol’s three phases, and the importance of consulting with a qualified dietitian who can help determine trigger foods to rethink your diet in the least restrictive way.

  • She covers who can benefit from a low-FODMAP approach, who should not be limiting their diets in this way, and how the key to success is personalization. Meghan stresses that the protocol is not treatment for digestive conditions, but a dietary intervention to reduce the discomfort and suffering from them.

  • Debunking popular misconceptions, Meghan addresses why the diet is a short-term strategy, and how most people go at it wrong. She stresses the dangers of being on the protocol long-term.

  • This conversation goes way beyond “eat this, avoid that.” We discuss how stress, sleep, and exercise impact gut health. And wrap up with lifestyle strategies, natural therapies, mental health practices, and supplements that can improve our digestion.

  • The key takeaway: Embrace a holistic approach to a FODMAP diet and personalize with support from qualified practitioners.

TESS'S TAKEAWAYS

  • FODMAPs are short-chain carbohydrates that can cause digestive problems.

  • The Low FODMAP Diet is a temporary therapeutic protocol, not a long-term plan.

  • The protocol is a three-step process—elimination, reintroduction, and personalization.

  • The protocol is the most evidence-based dietary strategy for managing IBS.

  • It can also support people with IBD, SIBO, and ongoing bloating or endometriosis.

  • FODMAP sensitivities may shift with foodborne illnesses, stress, or hormone changes.

  • Once you determine food triggers, liberalize your diet to avoid nutrient deficiencies.

  • Without the guidance of a practitioner, the FODMAP Diet can do more harm than good.

ABOUT MEGHAN

Meghan Donnelly, MS, RDN, CDN, is a registered dietitian specializing in gastrointestinal nutrition, and is Director Of Health Communications at the Celiac Disease Foundation

Her experience spans clinical practice, nutrition counseling, medical nonprofits, and the food industry.

In her private practice at Nutmeg Nutrition, Meghan helps her clients establish a balanced and joyful relationship with food, particularly when managing digestive disorders (IBS and SIBO), food intolerances, gluten-related conditions (celiac disease), and disordered eating.  

She also provides nutrition counseling for heart health, kidney disease, weight management, and food intolerances. Monash University certified, she guides clients on Low-FODMAP diets.  

As lead dietitian for Skinny60®, Meghan provides nutrition education and support for participants in the 60-Day Reset.