Have you ever wondered if some people simply have a fast metabolism? You know the kind of people that seem to be able to eat anything and still maintain a healthy weight? Does your metabolism slow as you age? What about the effect of the menopause? And are intermittent fasting and certain supplements evidence based ways to speed up your metabolism?

These are the questions I put to Dr Adam Collins, researcher at University of Surrey where I completed my Nutritional Medicine Masters. Dr Collins is a well-known expert in metabolism and nutrition science. He's done a lot of research on energy expenditure, intermittent fasting, and how different diets affect metabolism.

Topics we cover include …

🔬 What is metabolism?

🐢 Can you actually have a “slow” metabolism?

📉 Metabolism and aging

❄️ Cold exposure for metabolism

😰 Stress and metabolic dysfunction

🔁 What is metabolic flexibility?

❤️ Why it matters (beyond weight)

⚡ Carbs vs fat—who fuels what?

🧠 How to boost metabolic flexibility

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Up to 40% of cancers are attributable to modifiable risk factors, including diet, obesity, alcohol, tobacco use, and physical inactivity. The WCRF estimates that about 1 in 3 cancer cases in high-income countries could be prevented by healthier diets, maintaining a healthy weight, and regular physical activity. And according to the National Cancer Institute in the US, physical inactivity is a recognized risk factor for colon, breast, and endometrial cancer.

But even with the best intentions there’s a lot of confusion around lifestyle and cancer. One day it’s red meat, the next it’s microwaves. We hear about them in headlines, social media posts or passed around in conversation, which can make it really hard to know what matters most.

I’m joined today by Professor Robert Thomas, an NHS oncologist and researcher who’s spent decades studying how lifestyle (from food and movement to gut health and supplements) affects cancer risk and recovery.

We talk about …

🧠 Common cancer myths - mushrooms and herbs

🥗 Anticancer diets – What to eat to reduce your risk.

🦠 Gut health & cancer – The powerful connection between your microbiome and cancer.

🔥 Inflammation & risk – How chronic inflammation increases cancer susceptibility.

🏃‍♂️ Exercise & cancer – The science behind how movement helps fight cancer cells.

🧴 Microplastics & personal care products – The hidden risks in everyday items.

💄 Aluminium in makeup & deodorants – Investigating the potential health impacts.

👶 Fertility impact – How lifestyle and environmental exposures may affect reproductive health.

He’s also recently appointed Head of Integrative Oncology at The Royal London Hospital for Integrative Medicine making him the UK’s first NHS Integrative Oncologist, to complement his existing role as an NHS Consultant Oncologist at Addenbrooke's and Bedford Hospitals. He is also a Clinical Teacher at Cambridge University. At the start of our conversation we talk about his new role and the types of patients he encounters.

View the podcast on our YouTube Channel

You can find out more from Professor on his YouTube channel https://www.youtube.com/@ProfThomasMD

Books: How to Live, Keeping healthy with Cancer

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Today marks the 300th episode of The Doctor’s Kitchen podcast!

I started this journey 8 years ago and since then I’ve sat down with world-class researchers, doctors, nutritionists, neuroscientists, exercise physiologists and many more, all with the aim of sharing their knowledge so you can improve your health and understanding of food and lifestyle medicine.

What has made the biggest difference to me personally are a few simple rituals I return to, even when I am sleep deprived, overwhelmed… or caring for a very cute but very demanding newborn.

In this episode, I’m walking you through the daily and weekly habits, shared by some of our amazing guests, that have actually stuck. The ones that help me feel better, think more clearly and stay grounded, no matter what the week throws at me.

Episodes referenced in this podcast:

• Ep #281 with TJ Power - Digital devices and mental health
• Ep #291 - Prof Leigh Breen - Exercising for older adults
• Ep #6 - Dr Michael Farquar - Sleep for Night shift workers
• Ep #282 - Dr Kiran Chopra - Exercise strategies for longevity
• Ep #193 with Johann Hari - Why You Can't Focus
• Ep #267 with Dr Louisa Nicola - Sleep health and how to optimise your brain

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It’s World Gut Health Day this week (officially known as World Digestive Health Day), and I wanted to do a dive into something I get asked about more frequently. And that’s leaky gut.

I’m cutting through the supplement marketing and scary-sounding terms to talk about:

• Why your gut might need support even if you feel totally fine
• Why gut health is linked to bloating, fatigue, brain fog and more
• What “leaky gut” actually means
• Can you test for leaky gut, and are the online kits worth it
• My favourite foods for a healthy gut

For gut-friendly recipes, check out our collection in the Doctor’s Kitchen app and website – all designed with fibre, polyphenols and plant variety in mind to support a healthy gut.

👉 https://tdk.link/gut-health-recipes

Papers referenced

https://pmc.ncbi.nlm.nih.gov/articles/PMC6790068/#S10 https://www.clinicalnutritionjournal.com/article/S0261-5614(21)00416-7/fulltext https://pubmed.ncbi.nlm.nih.gov/29519916/ https://pmc.ncbi.nlm.nih.gov/articles/PMC8427160/#s1

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We brush our teeth every day. It’s one of those things we do without thinking. But your mouth is doing so much more than just housing your teeth. It has a strong link with protecting your heart, avoiding type 2 diabetes and even potentially preventing dementia.

In fact having a regular hygienist appointment can improve your blood sugar levels and significantly reduce inflammation in the body.

Flossing, brushing properly and even tongue scraping is far more than keeping your teeth looking spick and span, it’s critical to keeping inflammation in balance which could extend to longevity benefits. But what about fluoride in toothpaste, mouth washes, antibacterial gums and prebiotic flossing?

Today, I’m joined by Dr Victoria Sampson - a functional dentist and researcher who’s changing how we think about oral health. She’s helping us understand that the mouth isn’t separate from the rest of the body, it’s also where chronic disease shows up.

Today we’ll discuss:

👄 The 5 signs your mouth is trying to tell you about your health

🧠 What your oral health reveals about your brain, heart and gut

🦷 How to care for your mouth in under 5 minutes a day

👩🏽‍⚕️ The daily routine a dentist wants you to follow

💦 Why saliva is much more important than you think

🔬Whether we should be testing our ‘oral microbiome’?

We’ll also talk about why I’m going to be adding propolis, mouth taping, chewing gum and tongue scraping to my regime. If you’re interested in learning more about Dr Victoria’s clinic and tests, check the show notes or head to https://thslabs.co.uk

Oral Microbiome Test (ORALIS-1): https://thslabs.co.uk/

@Drvictoriasampson

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I asked some of the brilliant minds we've had on The Doctor’s Kitchen Podcast (doctors, neuroscientists, psychiatrists, nutritionists) one question: What’s your number one tip for better mental health?

The truth is, there’s no single fix. Mental health is a mosaic of biology, lifestyle, connection, meaning and nourishment. It’s not something we “deal with” when things fall apart. It’s something we need to tend to every day, like we do with brushing our teeth or watering plants.

These insights are not only evidence-based, but deeply human. I hope you find something in this episode that resonates with you, whether it’s a small shift, a fresh perspective or a reminder to care of yourself.

You’ll hear from:

• TJ Power, neuroscientist
• Dr Romayne Gadelrab, Consultant Psychiatrist
• Julia Samuel, psychotherapist
• Kiran Chopra, Sport and Exercise Physiologist
• Dr Megan Rossi, dietitian & researcher
• Drew Ramsey, Psychiatrist
• Dr. Amrita Vijay, researcher
• Dr Miguel Toribio-Mateas, neuroscientist

I’ll be giving you the low down on food and mental health to kick off the episode too!

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What if ageing well had less to do with your genes, your skincare routine or the supplements you take ... and more to do with your immune system?

Most of us think about immunity as something that only matters when we’re fighting off a cold or flu. But actually, it’s quietly working behind the scenes every single day shaping how we feel, how we recover and how long we stay well.

Our immune health is also constantly evolving and changing over our lifecycle. From birth to our 20s, midlife and beyond our immune system plays a critical role in how we feel, our risk of disease and how well we age.

Dr Jenna Macciochi is an immunologist specialising in the intersection of nutrition, movement, mind-body practices and lifestyle with the immune system in health and disease.

She’s also a brilliant science communicator who has a beautiful way of weaving science with story. In her new book, Immune to Age, Dr Jenna reframes immunity not as a fortress that springs into action, but as a lifelong partner guiding us through the seasons of our lives from the day we’re born to the way we age.

We dive into:

• Why inflammation is not just good or bad
• How your immune system changes with age
• What to focus on in your 20s, 40s and beyond
• The role of inflammation, infection and stress in ageing
• Supplements like creatine, collagen, taurine, peptides and nootropic mushrooms

Follow @dr_jenna_macciochi and preorder the book “Immune to Age”

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Seasonal allergies seem to be getting worse. A lot of people are feeling it now.

It’s common to reach for antihistamines without really thinking about it. They definitely have their place and can be really helpful when symptoms are bad. But taking them every day is something we still don't fully understand, especially when it comes to long-term effects.

If you deal with allergies for months each year, it’s worth pausing and exploring strategies that might be more sustainable.

Many healthy habits that support overall health can also help manage inflammation, immune function and allergy symptoms. They’re not always as quick as taking a capsule, but they can make a real difference over time.

In this episode, I'm sharing:

• Why seasonal allergies seem to be getting worse
• The role and potential risks of antihistamines
• 5 daily habits that could ease allergy/hay fever symptoms

Quick note about nettle: I didn't find much strong research, but that doesn't mean it couldn't help some people. It just shows how much more there is to learn.

Sources

• Antihistamines: Sue et al. J Allergy Clin Immunol Pract. 2024. PMID: 38935035.
• Vitamin D: Malik et al. European Respiratory Journal. 2015
• Dietary diversity: Nakamoto et al. Asia Pacific Journal of Clinical Nutrition. 2019
• Fibre: Sdona et al. Clinical and translational allergy. 2022
• Polyphenols, chlorophyll, quercetin, vitamins C, D and E: Pellow et al. Complement Ther Med. 2020
• Fruits & vegetables: Kusunoki et al. Pediatr Allergy Immunol. 2017 | Oh et al. Pediatr Allergy Immunol. 2020
• Probiotics: Ried et al. Frontiers in Nutrition. 2022
• Ginger & curcumin: Yamprasert et al. BMC Complement Med Ther. 2020 | Wu et al. Ann Allergy Asthma Immunol. 2016
• Saline rinse: Wang et al. Allergologia et Immunopathologia. 2020
• Steam inhalation: Vathanophas et al. Asian Pac J Allergy Immunol. 2021

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