ZOE Science & Nutrition

Dr. Andrew Jenkinson discusses the network of hormones that act as the body's internal postal service, delivering messages to organs. He highlights a specific hormone that plays a crucial role in weight regulation and explains the consequences when it doesn't function properly. The episode also includes three practical tips listeners can try the next day to support their hormonal health.

Professor Carmine Pariante explains how the body's stress response, designed for acute threats, becomes harmful when chronic. He covers the physiological effects of sustained stress—including inflammation, heart disease, and brain changes—and how perceived control, exercise, and diet influence resilience. The episode also debunks viral trends like 'cortisol face' and explores why modern life makes it hard to switch off.

This episode is a short, most-replayed segment on gut microbes featuring Professor Tim Spector and microbiome researcher Nicola Segata. Spector describes gut microbes as 'mini pharmacies' because they produce powerful chemicals that support health. The conversation emphasizes that not all microbes are beneficial and frames the digestive system as an ongoing battle between helpful and harmful bugs. The key takeaway is that simple dietary changes can shift the balance toward the beneficial microbes.

Dr. Alice Lichtenstein joins ZOE Science & Nutrition to debunk common myths about dietary fat. She explains why the type of fat matters more than the amount, how saturated fat drives heart disease, and why replacing butter with olive oil could help you live longer. The conversation covers the history of egg fears, the mistake of low-fat high-sugar foods, and practical food swaps for a heart-healthy diet. Lichtenstein also discusses cholesterol numbers, the liver's role in converting sugar to fat, and the limited benefits of grass-fed beef.

Professor Daniel Davis discusses why the popular concept of 'boosting' the immune system is scientifically misleading. He explains that the immune system is too complex and hidden to measure as simply 'strong' or 'weak,' and that most supplement and superfood claims lack evidence. The real ways to support immune health align with general healthy living — diet, exercise, and sleep — rather than any single quick fix.

Professor Rob Semple explains how insulin resistance — a condition affecting roughly 1 in 4 people — quietly raises the risk of heart disease and cancer, often with no change in blood sugar and no obvious symptoms. The episode covers what insulin does, why its absence was once fatal, how resistance progresses toward type 2 diabetes, and five practical strategies for regaining insulin sensitivity: managing weight (especially visceral fat), using exercise strategically, reducing stress, prioritizing sleep consistency, and recognizing that rapid post-meal blood sugar drops can be an early warning sign. Semple also discusses visible skin signs of high insulin and why generic online symptom lists are often misleading.

Professor Marion Nestle joins ZOE Science & Nutrition to discuss food additives. She explains what they are, how they ended up in so many ultra-processed foods, and why it's crucial for consumers to understand the long lists of unfamiliar ingredients on food labels. The episode also examines how additives are tested for safety and whether they are truly safe.

Professor Jimmy Bell, a world-leading expert in measuring visceral fat, explains the fat that wraps around the organs and raises the risk of heart disease and cancer. He shows why two people can weigh exactly the same yet carry very different amounts of this hidden fat, and why a slim appearance does not guarantee healthy body composition. The conversation covers "skinny fat," inflammatory signals, very low body fat, and why measuring where fat sits matters more than total weight. Bell also explains how diet reshapes body fat, how quickly visceral fat can shrink, and why dieting alone can quietly cost muscle.

Dr. Nour Makarem joins ZOE Science & Nutrition to discuss the critical role of sleep in heart health. Sleep is described as the foundation upon which diet, exercise, and overall wellbeing are built. Research suggests that poor sleep quality can significantly increase the risk of heart disease and heart attacks. Notably, both too little and too much sleep raise concerns, indicating an optimal range. This episode highlights the connection between sleep and cardiovascular health and why it matters.

Harvard professor Daniel Lieberman explores how human evolution shaped our hunger, fat storage, and food cravings, and why modern diets often fail. Drawing on his new book 'Fed Up', he explains the mismatch between our ancient biology and today's food environment, why calorie counting can mislead, and what the healthiest eating patterns share. The conversation covers cooking's role in human evolution, the myth of a single Paleo diet, and how processed foods exploit ancient cravings.

In this most replayed moment, Dr. David Seres joins ZOE Science & Nutrition to explore whether vitamin supplements are worth the money. The conversation focuses on the science behind vitamin C, vitamin D, and multivitamins, and highlights that supplements are not regulated like medicines. It's a concise, evidence-based look at the supplement industry.

Chef Hugh Fearnley-Whittingstall and ZOE Chief Scientist Sarah Berry discuss why fibre is far more important than most people realise — and how the world’s protein obsession may be distracting us. They explain how fibre feeds gut microbes, helps you stay full, and slows the release of sugar into your blood, with research linking higher fibre intake to lower risks of heart disease, dementia and some cancers. The episode offers practical, affordable ways to hit the recommended 30 grams a day using everyday foods, including why frozen peas can be a nutritional shortcut.

Nutrition researcher Alan Aragon and Professor Sarah Berry discuss the science of sustainable fat loss, explaining why popular diets like Atkins and carnivore fail to deliver long-term results. They explore how to find an effective, science-backed approach, and introduce the counterintuitive idea that, for some people, the first step to losing weight may involve gaining a little. The episode cuts through the noise of diet trends to focus on what actually works for fat loss.

Tim Spector and Sarah Berry explore the science of sugar metabolism and blood glucose management. Rather than demonizing sugar, they discuss how specific forms of sugar affect blood glucose differently, why sharp spikes and crashes drive hunger and inflammation, and practical strategies to enjoy sweet foods without metabolic disruption. The episode challenges common misconceptions about fruit, juice, and sweeteners.

Dr. Vonda Wright challenges the conventional focus on weight loss, arguing that body composition—specifically muscle mass—is a more meaningful health goal. The episode explores how muscle tissue drives metabolism, supports strength, and helps regulate fat storage, positioning muscular development as a foundational intervention for lifelong health.

Dr. Ezekiel Emanuel, a leading oncologist and bioethicist, distills decades of longevity research into six practical rules for a longer, healthier life. Drawing from his book Eat Your Ice Cream, Emanuel challenges popular wellness trends and focuses on what actually matters: relationships, mental activity, diet, exercise, and sleep. The episode unpacks why many wellness interventions fail, what the science really says about supplements and alcohol, and how loneliness becomes a disease vector equivalent to smoking.

Dr. Bill Harris and Professor Sarah Berry unpack the contradictory evidence on omega-3 fatty acids and cardiovascular health. They discuss why observational studies show heart benefits while some trials suggest potential harm, explain the fatty acid's essential roles in the body, and offer an evidence-based guide to food versus supplements.

Dr. James Cole, a leading expert on prehistoric diets, joins Dr. Federica Amati to examine the Paleo diet through the lens of actual archaeological and anthropological evidence. The episode explores what ancient humans really ate, why the modern Paleo diet's claims about ancestral eating may be overstated or misleading, and what science actually says about grains, beans, dairy, and meat in human evolution. Cole reveals that there was no single ancestral diet, that ancient humans ate a far more diverse range of foods than modern Paleo suggests, and that some of Paleo's restrictions may actually harm heart and gut health.

Dr. Thais Aliabadi discusses why breast cancer screening must be individualized rather than following a one-size-fits-all approach. The episode explores how personal factors—genetics, body composition, and lifestyle—shape cancer risk and determine optimal screening timing and methods. Aliabadi shares how her own experience with cancer has influenced her thinking about prevention and personalized medicine.

Felice Jacka and Tim Spector explore how diet and the gut microbiome affect brain health, mood, and dementia risk, drawing on research involving over 10 million people. They explain the mechanisms by which food influences the brain through inflammation and microbial pathways, identify which foods support brain health versus harm it, and offer practical, affordable dietary strategies for protecting cognition and mental health.

Professor Tim Spector explains what blood pressure actually measures, why high readings are dangerous for the whole body, and how monitoring it has become easier than ever. He shares practical, salt-focused dietary strategies that can have a powerful impact on long-term cardiovascular health. The episode is a short, actionable primer on a risk factor many people overlook.

In this first ever live audience recording, Prof Tim Spector, Prof Sarah Berry and Dr Federica Amati answer listener questions about gut health, dementia risk and weight loss. Drawing on decades of research and ZOE data, they explain how diet can influence the gut microbiome, brain health, hunger and long-term wellbeing. The conversation covers how fast the microbiome adapts, why certain foods keep you fuller for longer, the role of resistant starch, and simple breakfast and snack upgrades. The team also unpacks why ultra-processed foods undermine satiety and how small dietary changes can yield lasting benefits.

In this compilation episode, ZOE scientists Tim Spector and Sarah Berry dive into the world of dietary supplements. They examine why supplements have become so popular, what the scientific evidence says about their actual benefits and risks, and how to decide whether they have a place in your daily routine.

Dr Federica Amati, ZOE’s Head Nutritionist, explains how GLP-1 drugs like Ozempic, Wegovy and Mounjaro work and why losing weight doesn't automatically equal better health. She details why many users experience side effects and the surprising brain effect that silences food noise. The conversation covers how fibre can stimulate the body’s own GLP-1 production, why ultra-processed foods override fullness signals, and the hidden risk of muscle and bone loss during rapid weight loss. She shares four practical principles to protect lean mass and support long-term health whether on or off these medications.

In this replay of the most popular moment, Professor Janet Lord explains inflammaging, the chronic inflammation that accelerates ageing. She outlines why it poses a major threat to healthy longevity and shares simple, science-backed strategies to reduce it. The conversation highlights practical lifestyle changes that can lower inflammation and slow the ageing process.

Ed Bullmore, Professor of Psychiatry at King's College London, explores how inflammation in the body can change brain function, contributing to low mood, anxiety, depression, and dementia risk. He examines factors like obesity, gut health, gum disease, menopause, aging, and stress that drive inflammation. He challenges the traditional separation of mental and physical health, arguing that many mental symptoms have physical roots. The conversation covers evidence for lifestyle interventions, particularly diet and exercise, to reduce inflammation and protect brain health.

Professor John McGrath explores the complex relationship between sunlight and skin health. The episode addresses a fundamental trade-off: sunlight is essential for vitamin D production, but excessive exposure accelerates skin aging and increases skin cancer risk. McGrath helps listeners understand how much sun exposure is optimal, whether most people are getting too little or too much, and where sunscreen fits into a balanced routine.

Professor Robin May, the UK Government's Chief Scientific Advisor and leading microbiologist, explores the emerging science behind mushrooms and human health. The episode examines which health claims about mushrooms are real—from gut health and cholesterol reduction to brain protection—and which are exaggerated. May separates early-stage science from validated findings, explaining what mushrooms actually do inside our bodies and how to incorporate them effectively into a nutrition strategy.

Dr. Andy Chan explains how convenience makes ultra-processed foods appealing to time-pressed parents of young children, and how early exposure to these foods may shape future health trajectories.

Michael Pollan and Tim Spector explore how ultra-processed foods engineered around "craveability" override the body's fullness signals and drive addictive eating patterns. They examine the role of monoculture agriculture, government subsidies for commodity crops, and the replacement of home cooking with industrial food, then discuss practical interventions—including fiber, plants, and home cooking—to regain control over cravings without relying on willpower alone.

Journalist and wellness expert Liz Earle and nutritional scientist Dr. Federica Amati join ZOE to cut through the noise of viral social media health trends. The short discussion focuses on how to separate evidence-backed practices from exaggerated claims, using examples like red light therapy and cow fat supplements to highlight the gap between marketing and science.

Professors Martha Clokie and Tim Spector explore bacteriophages—viruses that live in the gut and attack bacteria—as a potential solution to antibiotic resistance, which could kill 10 million people annually if left unchecked. The episode examines how phages may fight infection, target cancer cells, and protect the microbiome, while discussing why antibiotic resistance has become a critical global threat and what everyday choices can support a healthier gut ecosystem.

ZOE's most replayed moment features a conversation between cold exposure researcher Dr. Susanna Søberg and ZOE co-founder Prof. Tim Spector. They examine whether the boom in ice baths, cold showers, and wild swimming is supported by rigorous science or is just a wellness trend. By critically evaluating the available studies, they weigh the claimed benefits against the evidence, offering a balanced perspective on a topic that has captured mainstream attention.

Prof. Adam Fox, an allergy specialist at King's College London, explores why allergies have tripled in recent decades and what gut health has to do with it. The episode challenges common misconceptions about allergies—including that 90% of people told they're allergic may not actually be—and reveals how the immune system is trained differently by the gut and skin. Fox discusses why peanut allergies became common in children, how eczema shapes immune responses, and practical strategies for managing hay fever and seasonal allergies, including newer treatments that retrain rather than suppress the immune system.

A conversation about how government policy, supermarket placement, and structural food system design shape individual dietary choices and population health outcomes. Explores the systemic forces beyond personal responsibility that determine what we eat and how healthy we become.

In this episode, gastroenterologist Dr. Giulia Enders challenges the popular notion of 'boosting' the immune system and instead advocates for balance. She explains that symptoms like fever and runny nose are active defenses, not signs of failure, and that suppressing them can sometimes backfire. Through her new book 'Organ Speak,' she details how diet, stress, sleep, and exercise modulate immune function, with sugar promoting inflammation and rest supporting health. The core message: health is about calibration, not brute strength.

Psychiatrist Dr. Judith Joseph joins Professor Sarah Berry to explore high-functioning depression, a condition where outward success masks inner emotional numbness and disconnection. They discuss why it is often overlooked in those who appear highly capable and how it can be recognized and addressed.

Dr. Ania Jastreboff, an obesity medicine researcher and co-author of 'Enough' with Oprah Winfrey, explains what GLP-1 drugs like Ozempic and Mounjaro actually treat beyond weight loss. She describes how these medications correct a previously unnamed hunger dysregulation, discusses the 94% diabetes risk reduction seen in trials, and explores why weight often returns after stopping. The episode covers cardiovascular and sleep apnea benefits, the disease model of obesity, common starting mistakes, and the risk of microdosing.

Dr. Will Bulsiewicz, a gastroenterologist, explores the brain-gut axis — the intricate network of nerves connecting the brain and gut. The episode investigates how these two systems constantly exchange signals and whether treating one can help heal the other, revealing practical applications of this emerging science.

Dr. William Li explores how cancer develops as a normal biological process that most people manage without issue, and explains the critical role of lifestyle and environment—not just genetics—in cancer risk. He discusses how everyday foods, movement, gut health, and toxin exposure can either fuel or suppress cancer growth, offering practical strategies to support your body's natural defences against the approximately 10,000 cancer cells most people carry.

A focused exploration of three specific foods that combat chronic inflammation, presented by ZOE's leading nutrition scientists. The episode explains how strategic dietary choices can address fatigue, disease, gut problems, and weight gain—without requiring drugs or detoxes. Tim Spector and Federica Amati demonstrate that food is one of the most powerful inflammation-fighting tools available.

Prof Tim Spector and Dr Federica Amati explore how five simple nutrition changes can boost energy and mood within 72 hours. They follow Lucy and Sarah through a six-week nutritional reset, revealing why people feel exhausted despite normal blood tests, how gut health drives energy levels, and the specific dietary shifts—bigger breakfasts, plant diversity, strategic food swaps—that produce measurable improvements. The episode challenges the assumption that fatigue must indicate a medical problem, showing instead how microbiome optimization can shift energy before any clinical markers change.

A deep dive into two of the world's most popular beverages: coffee and matcha. Andrew Kojima (matcha expert) and Prof. Tim Spector explore how these drinks work differently in the body, their distinct biochemical profiles, and whether one offers superior long-term health benefits. The episode uncovers the science behind why these drinks have become morning staples and what the research actually says about choosing between them.

Prof. David Nutt explains why alcohol ranks as the most harmful drug to society, how even moderate drinking affects the gut microbiome, sleep, and cancer risk, and what the science says about cutting back without giving up completely.

Jonathan Wolf compiles the biggest scientific insights from ZOE's 2025 season: microbiome testing breakthroughs, personalized nutrition advances, the rise of matcha, meal timing discoveries, and the growing evidence against ultra-processed food.

Tim Spector and Andrew Kojima compare the health effects of coffee and matcha. Both contain polyphenols and caffeine, but matcha's L-theanine produces calmer alertness while coffee's diterpenes have different cardiovascular effects.

Prof. Nicola Segata reveals results from analyzing 34,000+ microbiomes: 50 gut bacteria are strongly linked to health outcomes. Three powerful 'good bugs' suppress pathogenic bacteria and predict cardiovascular, metabolic, and immune health.

Tim Spector explains the full metabolic picture of menopause: changing body composition, altered glucose responses, increased inflammation, cardiovascular risk shifts, and bone density loss — and evidence-based dietary and lifestyle interventions.

Harvard gastroenterologist Dr. Trisha Pasricha explains why the gut is the most underappreciated organ in the body — producing 70% of immune cells, 95% of serotonin, and communicating constantly with the brain via the vagus nerve.

Former professional volleyball player Gabby Reece and Dr. Federica Amati discuss maintaining mobility, strength, and flexibility through aging. Why mobility loss accelerates disease risk and practical daily movements that preserve joint health.

Prof. James Betts, a leading expert on meal timing and metabolism, challenges the 'breakfast is essential' dogma. His research shows that skipping breakfast doesn't harm metabolism and may benefit some people — but the timing of your first meal matters more than whether you eat breakfast per se.

Spector shares his updated seven evidence-based habits for health: plant diversity, fermented foods, time-restricted eating, quality sleep, movement, stress management, and social connection.

Tim Spector and Sarah Berry share seven evidence-based nutrition strategies for 2025, synthesizing the year's research findings. Emphasis on plant diversity, fermented foods, olive oil, reducing UPF, meal timing, fiber variety, and personalized nutrition.

Bulsiewicz explains histamine intolerance — why certain foods (aged cheese, wine, fermented foods) cause headaches, flushing, and digestive distress in some people — and why the root cause is usually gut dysfunction, not the foods themselves.

Jonathan Wolf compiles the most impactful moments from ZOE's 2024 episodes: how your 'second brain' in the gut affects mood, why fasting doesn't have to be difficult, how olive oil transforms health, and the power of eating 30 plants a week.

Dan Buettner returns to distill his blue zones research into five daily habits anyone can adopt: natural movement throughout the day, plant-forward eating, purpose rituals, social connection at meals, and stress-shedding practices like napping or prayer.

Tim Spector explains how chronic low-grade inflammation — driven by gut dysbiosis, ultra-processed food, and poor sleep — is the common mechanism behind obesity, heart disease, diabetes, depression, and autoimmune conditions.

Spector explores chronic low-grade inflammation — the silent driver of heart disease, diabetes, Alzheimer's, and cancer — and which dietary patterns reduce it most effectively.

Dr. Chris van Tulleken explains what defines ultra-processed food, why it dominates modern diets, and how his self-experiment eating 80% UPF for a month produced measurable brain changes, weight gain, and disrupted hunger signaling.

Davina McCall takes over hosting duties to discuss menopause with Prof. Tim Spector. How diet affects menopause symptoms, why gut health influences hormone metabolism, and the daily choices that can reduce hot flushes and improve sleep.

Bulsiewicz identifies the four nutritional categories that drive gut health improvement: fiber diversity, polyphenols, fermented foods, and omega-3 fatty acids. He argues these four workhorses do more for health than any supplement.

Bulsiewicz unpacks Small Intestinal Bacterial Overgrowth (SIBO): what it actually is, why it is overdiagnosed, and why restrictive diets often make it worse rather than better.

Olive oil expert Elizabeth Berger and Prof. Tim Spector explain why high-quality olive oil may be the single most health-promoting food in the Mediterranean diet. How to identify real EVOO, storage mistakes that destroy its benefits, and cooking safely.

Wolf explores the bidirectional relationship between sleep and metabolism: poor sleep disrupts blood sugar control, increases hunger hormones, and reduces metabolic efficiency. But metabolic health also affects sleep quality.

Prof. Sarah Berry provides a comprehensive guide to managing blood sugar: why spikes matter for non-diabetics, the role of fiber, fat, and protein in blunting glucose response, and why a 10-minute post-meal walk is the single best intervention.

Chef Hugh Fearnley-Whittingstall and Tim Spector make eating 30 plants per week practical and delicious. Recipes, shopping strategies, and the mindset shift from 'five a day' to 'thirty a week' — including herbs, spices, seeds, and grains.

Wolf interviews leading menopause researchers about how hormonal changes during menopause affect metabolism, gut health, bone density, and cardiovascular risk — and what dietary strategies can help.

Tim Spector explains why the single most actionable dietary change is eating 30 different plant foods per week. The American Gut Project data: plant diversity is the #1 predictor of microbiome health, which in turn predicts metabolic and mental health.

Dr. Will Bulsiewicz and Tim Spector explain how antibiotics devastate gut microbiome diversity and what science says about rebuilding it — probiotics, fermented foods, and dietary fiber.

Tim Spector explains the bidirectional relationship between sleep and the gut microbiome. Poor sleep disrupts gut bacteria within days; disrupted gut bacteria impair sleep quality. The vicious cycle — and how to break it with diet.

Wolf and Spector examine Bryan Johnson's $2M/year anti-aging protocol: which interventions are evidence-based, which are experimental, and what the rest of us can learn from an extreme self-experimenter.

Tim Spector debunks popular fad diets — carnivore, juice cleanses, detox diets, blood type diets — using evidence from ZOE's research. The only consistent finding: diet quality (whole foods, plant diversity) matters more than any named diet approach.

Prof. Sarah Berry presents ZOE's PREDICT study data on meal timing: eating the same meal at different times produces dramatically different blood sugar and fat responses. Late-night eating is metabolically worse regardless of what you eat.

Tim Spector and barista James Hoffmann join Jonathan Wolf to explore the science of coffee: its effects on gut microbiome, metabolism, and cardiovascular health. Coffee is far more complex than caffeine.

Dan Buettner shares what decades of studying the world's longest-lived populations reveal. Jonathan, Dan, and Tim Spector journey through the blue zones — rare global hotspots where celebrating your 100th birthday is common.

Stanford's Christopher Gardner explains why diet wars are pointless — his landmark DIETFITS trial showed that diet quality matters more than macronutrient ratios. Whether you choose low-fat or low-carb, focusing on whole foods produces equivalent results.

ZOE's head nutritionist Dr. Federica Amati and James Clear discuss strategies for building lasting dietary habits. Why willpower fails, how environment design trumps motivation, and the compound effect of small daily food choices.

Spector presents the accumulating evidence against ultra-processed foods (UPFs): their association with obesity, cardiovascular disease, depression, and cancer. The problem is not any single ingredient but the processing itself.

Prof. Sarah Berry and Prof. Tim Spector share seven essential strategies for eating healthily in 2024 based on the latest ZOE PREDICT data. Focus on eating more plants, understanding personal glucose responses, and reducing ultra-processed foods.