Leigh Merotto, Dietitian | IBS, Gut Health and Fitness Expert
The GutFit Nutrition Podcast
Welcome to the GutFit Nutrition Podcast with Leigh Merotto, RD, MHSc—Registered Dietitian, gut health expert, and long-distance runner. This show is your go-to resource for all things gut health, IBS, and performance nutrition. Each episode delivers evidence-based tips, tools and strategies to help you tackle IBS and digestive symptoms, fuel running and fitness, and feel your best from the inside out. If you're ready to beat painful bloat and gut flare-ups, say goodbye to irregular poops, and thrive in your active life with whole body, REAL science-based tools — this is the show for you!
Author
Leigh Merotto, Dietitian | IBS, Gut Health and Fitness Expert
Category
Podcast website
Latest episode
Jul 10, 2026
Where to listen?
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Episodes
60: Celiac Disease — Symptoms You Could Be Missing, IBS Link & More With Selena Devries RD 10.07.2026 53:36
There is a lot of confusion about gluten in the gut health world. If you’ve been navigating gut issues for a while, you may have tried a gluten free diet or perhaps done a low FODMAP diet that involves limiting many foods with gluten like regular bread and pasta. While intolerance to gluten can exist on a spectrum, a very real and life changing disease that requires a strict, life long gluten fre...
59: Boston Marathon PB With Zero GI Issues — Cindy's Story 04.07.2026 44:56
Does it feel like gut issues or digestive stress show up at the worst possible time in your training or on race day? If you’re a runner who has ever worried about how your gut might react during a race, I think you’re really going to relate to today’s episode. I’m excited to introduce you to my guest, Cindy. Cindy is a client of mine and an incredible example of what can happen when a runner dials...
58: Hyrox Race Recap — Nutrition, Performance & GI Support 27.06.2026 32:40
In this episode, I’m taking you behind the scenes of my full Ottawa Hyrox race weekend, 2 days out all the way through race day and recovering after as a gut health Dietitian and endurance athlete. The thing with endurance athletes including both long distance runners and hyrox athletes is that they often mismanage their carb load, or try something new on race day… and that’s where things can go...
57: Can You Trust AI For IBS & Gut Health Advice? 19.06.2026 31:38
While AI can be a helpful tool, it lacks the clinical experience to make nutrition therapy recommendations, regulation and accountability and ability to assess safety of a recommendation. In today’s episode, we will discuss the main risks and considerations with using AI for health advice, and some key takeaways to use it safely should you choose to engage in AI based tools for your IBS and gut he...
56: Your 6-Step IBS Relief Plan (Masterclass Recap & Q/A) 12.06.2026 42:51
In this episode, I’m recapping highlights from my live masterclass, Break Free From IBS: Your 6-Step Roadmap to Lasting Relief. If you missed it, don’t worry! I’ve pulled together the most important takeaways and I’ll be answering some of your top Q&A questions from the session. I cover some pressing questions like: ✅ Is there an autoimmune component of IBS? ✅ What is the vagus nerve? ✅...
55: Finding Food Freedom With IBS — Angela's Story 06.06.2026 1:08:34
Does it feel like your IBS and gut symptoms run your life? I can’t wait to share about my guest and today’s inspiring episode. Angela is an amazing client of mine who is a fabulous example of someone who has put in consistent work to improve their digestive health and quality of life, and does not let fear of gut symptoms hold them back from life (travel, working out, social life). YOU’LL TAKEAW...
54: Non-Linear Goals: Breaking 20 Minutes in the 5K (Nutrition, Recovery & Mindset) 29.05.2026 41:12
On November 24th, 2025, at the Holly Jolly Fun Run in Toronto, I ran 5 kilometres in under 20 minutes. It was a goal I set for myself over a year and a half before I reached it, and truthfully, the process did not go exactly as expected! As I learned so much through the journey, I wanted to share a full recap of the training, nutrition, recovery, and mindset lessons gained along the way! YOU’LL T...
53: Milan Marathon Recap: Race Day, Fuelling & Digestive Support 22.05.2026 42:40
In this episode, I’m taking you behind the scenes of my full Milan marathon weekend, from the final days of tapering and carb loading to race morning, fueling during the race, and recovery afterward. I’m sharing exactly how I approached marathon nutrition and gut health to run a personal best with zero GI issues! As a Registered Dietitian, gut health expert, and endurance athlete, I know how frus...
52: Why Your Gut Changes in Your 40s (and What to Do About It) With Nicole Dynan RD 15.05.2026 43:36
If you’re in your early 40s or beyond and noticing more bloating, constipation, or unpredictable IBS symptoms, your hormones may be playing a bigger role than you think. In this episode, we’re breaking down the connection between perimenopause and gut health , and why the menopause transition can significantly impact digestion, the gut microbiome, and IBS symptoms. YOU’LL TAKEAWAY: ✅ What’s actu...
51: IBS and Travel: 7 Hidden Triggers (and How to Prevent Flare-Ups) 08.05.2026 35:48
If you have IBS or struggle with persistent gut issues, you’ve probably noticed that travel often leads to flare ups. For those with severe IBS, even short day trips can cause anxiety and worry about how your gut will react. For today’s episode, we will focus on why travel, including both flying and road trips, can lead to IBS and gut flare ups and what you can do about it! In today’s episode,...
50: Marathon Training: How to Prevent Gut Issues + Injury (Runner's GI Survival Guide) 27.03.2026 41:49
Struggling with gut issues during marathon training? From bloating and reflux to urgent bathroom stops mid-run, digestive issues affect up to 50% of endurance athletes—and they can seriously impact your performance if not addressed. As a Registered Dietitian and endurance athlete, I’m sharing both the science and real-life strategies I use (and teach my clients) to prevent gut issues during traini...
49: Top 8 Positivity Tools For Anxiety, Mood & Gut Health 21.03.2026 28:43
If you’ve been feeling anxious, overwhelmed, or mentally drained lately, this episode is for you. As a Registered Dietitian specializing in gut health, I’m diving into the powerful gut-brain connection and sharing my top positivity resources — including books, exercises, and simple tools that can help you boost your mood naturally, support your mental health, and improve how your body feels from t...
48: Can Your Gut Microbiome Impact Your Weight? 6 Gut Friendly Tools For Sustainable Weight Loss 13.03.2026 25:22
Trying to seek weight loss goals without sacrificing energy, your health and tanking your metabolism? In this episode, I’m sharing 6 practical tips to stay healthy while losing weight, and why your gut microbiome may play an important role in weight management and body composition! There’s a lot of conflicting advice online about weight loss. As a Registered Dietitian, I take a weight-neutral appr...
47: Nickel Allergy & IBS: The Connection You Need to Know 06.03.2026 43:43
If your IBS symptoms aren’t improving on a low FODMAP diet, there may be an overlooked trigger: nickel. In this episode, we explore the interesting connection between Nickel Allergy and IBS, including a condition called Systemic Nickel Allergy Syndrome (SNAS) that can mimic classic digestive disorders like IBS! YOU'LL TAKEAWAY: ✅ How Nickel Allergy and IBS may be connected through Systemic Ni...
46: Colon Cancer: Rising Rates & 5 Evidence Based Strategies to Lower Your Risk 28.02.2026 37:09
Colorectal cancer is rising, especially early-onset colon cancer in adults under 50. But the good news is that much of your risk is modifiable. In this evidence-based episode, we break down what you need to know about colorectal cancer prevention , including the most current research on diet, lifestyle, and the gut microbiome! YOU’LL TAKEAWAY: ✅ An overview of rising early-onset colon cancer rat...
45: 3 Little Known Ways to Improve Your Microbiome Health (Puppies, Cleaning Products & more!) 20.02.2026 29:52
Your gut health isn’t just about what you eat! In this episode, I’m sharing 3 little-known, evidence supported ways to improve your gut microbiome that go beyond diet — and can support better digestion, mood, energy, immune resilience, and even performance! YOU’LL TAKEAWAY: ✅ What the gut microbiome is and why microbial diversity is critical for digestion, immunity, metabolism, and mental health...
44: Chronic Constipation? Common Culprits & What You Can Do About Them 14.02.2026 37:27
Have you tried following your doc’s recommendations and just upped the fiber and water… OR simply taken a prescription laxative like Restoralax or Miralax and a fiber supplement per the Rx, and gone on your way? But you’re still struggling with chronic constipation and irregularity… Today we’re chatting about the common — and often complex — reasons for constipation to consider, and what you can d...
43: Breaking Down 4 Viral Gut Health Trends (Fibremaxxing, Aloe Vera, Beet Juice + Juice Fart Walks) 07.02.2026 19:39
Aloe vera juice. Beet juice “cleanses.” Fart walks. Fibremaxxing. But… which of these current social media trends actually holds up under scientific scrutiny? 🤔 YOU’LL TAKEAWAY: ✅ Which trends are mostly hype vs. evidence-based ✅ What might help IBS, and what could make symptoms worse ✅ How to approach fibre strategically if you have gut issues ✅ Why “science-based” on social media doesn’t...
42: 3 Ways to Improve Diet Diversity When Your IBS Makes You Scared of Food 31.01.2026 18:14
Heard that diet diversity is important for IBS and gut health but the thought of adding new foods make you anxious about how your gut will react? YOU’LL TAKEAWAY: ✨ Why extreme restriction won’t make your symptoms better in the long term ✨ How your nervous system and gut-brain interaction impact symptoms ✨ Using positive self talk and transformational vocabulary to improve symptoms ✨ Using m...
41: How Long Does it Take to "Fix" Your Gut Microbiome? (Antibiotics, IBS + More) 23.01.2026 22:17
You’ve been eating more fibre, started a low FODMAP diet, added some gut-directed lifestyle changes to your routine.. So how long will it take for you to “fix” your microbiome? Find out in today’s episode! YOU’LL TAKEAWAY: ✨ How long it takes for the microbiome to recover after a big disruption like antibiotics or food poisoning ✨Subjective measure the microbiome is improving ✨Why symptoms ca...
40: Colorectal Cancer Under 50? A Surgeon Breaks Down the Rise in Young People & How to Lower Risk 17.01.2026 48:52
Did you know there’s been a 2% annual increase in colon cancer cases in adults aged 20-39 since the 1990s? We need to spread the word… Colorectal cancer is NO longer just a concern for older adults. But, the encouraging news is that many cases are preventable! In our latest episode, colorectal surgeon and prevention advocate Dr. Zuri Murrel shares how you can feel more confident using evidence bas...
39: IBS and Perimenopause — How Hormonal Changes Impact Gut Symptoms 10.01.2026 31:00
Hot flashes, bloating, mood swings? In this episode we explore the connection between perimenopause and IBS, discussing how hormonal changes can impact your digestive health. We chat about common symptoms of perimenopause, the complexities of IBS, and practical strategies for managing symptoms through nutrition, exercise, and expert support. YOU’LL TAKEAWAY: ✨How ovarian hormonal fluctuations d...
38: 5 Micro Habits to Level Up Your Gut Health in 2026 02.01.2026 36:51
Your gut called… it’s ready for a glow-up in 2026 — without painful cleanses or expensive supplement protocols. In this episode of the GutFit Nutrition Podcast, we explore why gut health is foundational to your overall well-being and how simple, sustainable micro habits can support your digestion, hormones, mood, and immune system over time. YOU’LL TAKEAWAY: ✨ What micro habits are and how to use...
37: New Year, New Intentions: 9 Steps to Health and Fitness Goals You’ll Actually Stick With 26.12.2025 31:51
Every year, do you create new years goals that don't stick? It's time to change that. This week, we’re breaking down how to set realistic gut health & fitness goals that stick! YOU'LL TAKEAWAY: ✨ Setting intentions instead of resolutions ✨ Creating SMART goals for clarity ✨ Linking pleasure to behaviors to stay motivated ✨ Using accountability systems to actually follow through...
36: Runny Nose, Fatigue, Bloat, Rashes? Unpacking Histamine Intolerance & the IBS Link 19.12.2025 59:21
Itchy skin, fatigue, unresolved IBS symptoms – what could these symptoms have in common? It could be a sign of histamine intolerance, a condition that often goes under or misdiagnosed. Join this conversation with expert GI Dietitians on how to actually tell whether you may have histamine intolerance, and how to actually manage it through a structured elimination diet, nutrition optimizations &...
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