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Inside Matters

Inside Matters

De : Dr James McIlroy
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The gut health show – conversations with the most forward-thinking minds in health, fitness, science, nutrition and business. In-depth discussions about how our gut microbiome impacts our health, well-being, mood and more.

Inside Matters was conceived by microbiome expert Dr James McIlroy as a platform to raise awareness of the importance of the gut microbiome. Our aim is to inspire and educate listeners around the world about the importance of gut health, equipping them with the knowledge they need to transform their lives for the better.

Produced by the Podcast Studio Glasgow.

Copyright 2022 All rights reserved. Exercice et forme physique Fitness, alimentation et nutrition Hygiène et vie saine
Épisodes
  • Revolutionising Food Allergy Treatment: The Gut's Role in Immunity - Inside Matters - Ep 053

    Revolutionising Food Allergy Treatment: The Gut's Role in Immunity - Inside Matters - Ep 053
    Sep 10 2026

    Can Your Microbiome Rewrite Your Immune System's Food Allergies?

    Food allergies can be devastating. For families managing severe reactions, every meal carries risk, and even one mistake can have fatal consequences. But what if we could change the underlying biology rather than just manage avoidance?

    Dr James McIlroy explores a fascinating new study showing that faecal microbiota transplantation might help the gut relearn that foods like peanuts aren't a threat. The research points to an elegant mechanism: donor bacteria reshape bile acid metabolism, which then restores regulatory immune cells that suppress allergic responses.

    This episode reveals why the small intestine is critical to immune tolerance, how microbial metabolites influence what your immune system does and doesn't attack, and why owning a dog in early life might actually matter for allergy development. We're early in the evidence, but the signal is compelling.

    00:00 Food Allergy Nightmare 00:43 The Real Risk Numbers 01:52 Beyond Avoidance 02:57 Why Small Bowel Matters 04:52 FMT Peanut Trial Setup 05:54 Results and Caveats 07:12 Bile Acids and Tregs 09:56 Mouse Proof of Mechanism 11:41 Dogs and Early Exposure 13:17 What Comes Next
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    14 min
  • Why We Eat: The Science of Appetite, Nutrition and Weight - Prof Alexandra Johnstone

    Why We Eat: The Science of Appetite, Nutrition and Weight - Prof Alexandra Johnstone
    Jul 23 2026
    Professor Alexandra Johnstone joins Dr James McIlroy to explore what makes us hungry, what helps us feel full, and why healthier choices are rarely a matter of willpower alone. A conversation on chrononutrition, protein, food inequality, GLP-1 medicines and the future of public health. The big idea: Our bodies, habits and surroundings all influence how we eat. Better health therefore needs more than individual resolve: it needs practical advice, supportive environments and policies that make nourishing food easier to choose. Breakfast, body clocks and the timing of food Is breakfast really the most important meal of the day? Professor Johnstone’s answer is an emphatic yes—but not because breakfast has any magical property. Her research focuses on chrononutrition: the relationship between what we eat, when we eat it and the body’s roughly 24-hour circadian rhythms. The timing of the largest meal may not dramatically alter how much energy the body burns, but it can change how eating feels. A larger breakfast appears to help people feel fuller and may make a calorie-reduced diet easier to follow. The body also tends to be more sensitive to insulin earlier in the day. There is no universal clock-time definition of breakfast. A useful way to think about it is the first meal within two or three hours of waking. Fasting is a tool, not a loophole Intermittent fasting and time-restricted eating can be useful for some people, but they are behavioural strategies rather than shortcuts around energy balance. Professor Johnstone favours including the morning meal and offers the practical reminder: eat breakfast like a king and dine like a pauper. What does a healthy breakfast look like? From traditional cooked breakfasts to fortified cereals, the conversation explores nutritious options while highlighting the difference between everyday foods and occasional treats. Hunger and appetite are not the same thing A clear and helpful distinction between true hunger and appetite, and why reducing eating behaviour to willpower alone is so misleading. Why protein is filling Protein is the most satiating nutrient. The episode dives into the science of satiety, the importance of whole-food sources, and why solid protein tends to be more filling than liquid forms. Fibre does a different—but equally important—job While protein excels at satiety, fibre is essential for gut health. The trade-offs and benefits of both are explored. The obesity paradox and fixing the food environment Obesity is strongly patterned by inequality. The discussion covers food insecurity, the obesogenic environment, retail promotions, and the need for policy changes that make healthier choices easier. Ultra-processed food: a debate that needs more evidence A nuanced look at ultra-processed foods, their role in the diet, and what the current science can – and cannot yet – tell us. GLP-1 medicines: powerful treatment, unanswered questions The benefits, limitations, and challenges of GLP-1 medications, including muscle preservation, long-term use, and access/inequality concerns. Alcohol, Mediterranean patterns and the value of connection The role of social connection, shared meals, and balanced enjoyment of food and drink. A practical takeaway: build patterns, not perfection Realistic, compassionate advice for building sustainable eating habits without shame or moral judgment. What comes next Professor Johnstone shares her vision for the future of nutrition science, including better guidance for shift workers, updated protein recommendations, and improved food systems. About the Conversation In this episode of Inside Matters, host Dr James McIlroy speaks with Professor Alexandra Johnstone, Chair of Nutrition at the University of Aberdeen. Timestamps: 00:00 Meet Professor Alex Johnson01:53 Breakfast and Chrononutrition05:13 Fasting and Eating Windows07:59 What Makes a Healthy Breakfast10:42 Hunger vs Appetite Explained15:49 Protein and Satiety Science18:20 Obesity Paradox and Poverty19:53 Fixing the Food Environment23:11 Gut Brain Axis and Weight Defense27:06 Obesogenic Retail and Policy Changes31:16 Alcohol Mediterranean Diet and Blue Zones38:05 Why Protein Fills You Up38:52 Protein Satiety Mechanisms39:32 Amino Acids vs Whole Protein40:48 Liquid Meal Replacements43:49 Ultra Processed Food Debate50:41 Scotland Diet Reality Check52:37 Red Meat and Cancer Risk53:47 GLP-1 Weight Loss Challenges55:07 Microdosing and Inequality01:04:19 Muscle Loss and Nutrition01:05:50 Fibre Deep Dive01:08:21 Sweeteners and Microbiome01:10:44 Future Vision and Wrap Up
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    1 h et 13 min
  • The Importance of the Reproductive Tract Microbiome: Insights from David MacIntyre

    The Importance of the Reproductive Tract Microbiome: Insights from David MacIntyre
    Apr 2 2026
    For years, the spotlight in microbiome research has been firmly on the gut. We’ve learned that diversity there is generally a good thing—linked to resilience, health, and better outcomes. But what if one of the most important microbiomes in the body follows completely different rules? In a recent conversation, Dr James McIlroy sat down with Professor David MacIntyre, Director of the Robinson Research Institute, to explore a rapidly emerging field: the female reproductive tract microbiome. What they uncovered challenges many assumptions—and could transform how we think about pregnancy, birth, and early life health. 00:00 Show Returns 01:34 Why Reproductive Microbiome 05:15 Low Diversity Health 09:24 Lactobacillus Protection 12:06 Human Uniqueness 14:17 Population Differences 16:31 Oral Probiotics Myth 19:25 Vaginal Biotherapeutics Trial 22:11 Host Immune Response 27:03 Dysbiosis Triggers 30:42 Microbiome and Preterm Birth 33:06 Labor Inflammation Pathways 38:10 Pregnancy Microbiome Shifts 39:11 Screening and Group B Strep 40:57 Microbiome Screening Potential 42:06 Global Data Predictive Signatures 43:23 Limits of Current Risk Tools 45:30 Point of Care Profiling Vision 46:50 Swab Mass Spec Barcoding 48:27 Composition Versus Host Response 49:58 Metabolic Dark Matter 52:13 Beyond Bacteria, Viruses, and Fungi 55:48 Vaginal Probiotic Trials 57:39 Phase Two Trial Endpoints 01:01:28 Vaginal Microbiome Transplants 01:05:46 Birth Seeding After C Section 01:10:57 Do Vaginal Strains Persist 01:14:05 Ten-Year Personalised Medicine 01:17:45 Wrap Up And Where To Find A Different Kind of Microbiome When we talk about the gut microbiome, diversity is often considered a hallmark of health. The reproductive tract? It’s the opposite. In healthy women, this environment is typically: Low in diversityDominated by one key group of bacteria: Lactobacillus This might sound counterintuitive—but it’s by design. Why low diversity works here Certain Lactobacillus species—particularly Lactobacillus crispatus—play a protective role by: Producing lactic acid, keeping the environment acidic (around pH 4)Preventing harmful microbes from growingBlocking pathogens from attaching to tissueProducing antimicrobial compounds In short, they create a stable, protective ecosystem. When this balance is disrupted and diversity increases, it’s often linked to: InfectionInflammationPoor reproductive outcomes A Unique Human Feature One of the most surprising insights? Humans are the only species known to have a Lactobacillus-dominated reproductive microbiome. Even our closest primate relatives don’t share this feature. That suggests this system evolved relatively recently—and likely offers a meaningful biological advantage, particularly in pregnancy and childbirth. The Link to Preterm Birth Preterm birth—defined as delivery before 37 weeks—affects around 1 in 10 pregnancies globally and remains a major medical challenge. The microbiome appears to play a key role, particularly in early preterm births. What’s happening biologically? In a healthy pregnancy, labour is triggered by controlled, sterile inflammationThis process helps: Break the membranes (waters)Open the cervixInitiate contractions But if inflammation starts too early, it can trigger premature labour. Where the microbiome fits in A Lactobacillus-dominant microbiome helps: Keep inflammation lowMaintain a strong mucosal barrierReduce infection risk When this balance is lost: The environment becomes less acidicInflammatory molecules increaseThe barrier weakensRisk of infection—and preterm labour—rises Once inflammation starts, it’s very difficult to switch off. That’s why prevention is so important. What Disrupts the Balance? Several factors can shift the microbiome away from its protective state: Antibiotics (even when used for unrelated infections)Sexual transmission of bacteriaHormonal changesMenstruationHygiene practices like douching Even small changes in pH or environment can allow harmful bacteria to gain a foothold. Can We Predict Risk Earlier? One of the most exciting areas of research is using the microbiome as a predictive tool. Scientists are working towards: Identifying microbial “signatures” linked to higher riskMeasuring both: Which microbes are presentHow the body is responding to them New technologies can now analyse a simple swab and generate a metabolic “barcode” in minutes—potentially enabling rapid screening. The long-term vision? Routine testing that identifies at-risk pregnancies early—before symptoms appear. Can We Change the Microbiome? If we can measure it, can we fix it? 1. Oral probiotics: limited impact Despite widespread marketing, there’s little evidence that oral probiotics reliably reach or colonise the reproductive tract. They may have indirect benefits—but they’re not an efficient delivery method. 2. Targeted vaginal probiotics More promising is direct delivery of ...
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    1 h et 19 min
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