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Lithium is one of those molecules most people think they understand, until you zoom out. Yes, it’s a time-tested medication for bipolar disorder. But at tiny, trace doses, lithium starts to look like something else entirely: a potential micronutrient with outsized influence on mood stability, inflammation, and brain ageing.

We walk through why interest in low-dose lithium is rising in the brain health and longevity world, even as human clinical trials are still early. John and I talk about what lithium is chemically, why it’s so bioavailable, how it crosses the blood-brain barrier, and why the kidneys matter more at prescription doses than at supplement-scale milligrams. Then we connect the dots on mechanisms people care about most for neuroprotection: GSK-3 inhibition, support for BDNF, a tilt toward calming inhibitory signalling (GABA), better balance in serotonin pathways, and less glutamate-driven mitochondrial stress.

We also wrestle with the bigger public health angle: what happens when we treat chronic disease as “too much of everything” and ignore deficiency and nourishment. Soil mineral depletion, variable food mineral content, and strong population associations with lithium in drinking water (including mental health measures and Alzheimer’s mortality) make this a conversation worth having, carefully and objectively.

For slides and open-source references: www.thehealthedgepodcast.com

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Cholesterol warnings have a way of flattening any nutrition story into one scary number, even when the bigger picture points the other way. We take on one of our favorite topics coffee and zoom in on the debate that keeps resurfacing: should you avoid unfiltered coffee because it contains cafestol, a compound known to raise cholesterol modestly?

We break down what actually changes when you switch from filtered coffee to unfiltered coffee methods like French press or Turkish coffee. Paper filters remove much of the coffee oil fraction, including diterpenes such as cafestol and kahweol, while leaving plenty of other valuable compounds like chlorogenic acids. Then we ask the more important question: if coffee consistently shows protective associations for cardiovascular health, metabolic health, and even brain health, why do so many public health messages treat a small lipid bump as the final verdict?

From endothelial function and inflammation to insulin sensitivity, fat oxidation, and LDL oxidation resistance, we explore why cafestol may be far more beneficial than the headlines suggest. We also connect this coffee debate to a broader problem in modern nutrition and medicine: prioritising a single biomarker over lived outcomes and overall risk. Finally, we get practical about brew choices, lighter roasts, steep time, and the easiest way to ruin a great cup by adding sugar, synthetic creamers, or highly processed sweeteners.

If you love coffee, keep loving it !

For video recording and slides: www.thehealthedgepodcast.com

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We break down new research showing how a simple daily walking habit drives outsized gains in longevity, heart health, brain health, and mood. We also zoom out to the bigger idea that walking is not “extra credit” exercise but a basic human requirement that modern life keeps pushing out.
• why small doses of movement deliver big risk reduction
• what a systematic review and meta-analysis actually mean
• why around 7,000 steps per day stands out versus 2,000
• why cadence and speed matter less than total steps for most people
• links to lower risk across mortality, cardiovascular disease, dementia, depression, diabetes, cancer, and falls
• how outdoor context adds benefits through light, nature, and social connection
• the “walking meetings” idea and a negotiation story that hinged on taking a walk
If you like what we're sharing, please share with your those you love, your friends. All of this content can be found at our website, the healthedgepodcast.com.

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One photon travels nearly 93 million miles and still arrives with a job to do. We dig into sunlight as biology-changing information, starting with Einstein’s photoelectric effect and ending with a practical, unsettling question: what are we giving up when we spend most of life indoors and out of sync with the day?

We walk through the spectrum in plain language and connect it to real physiology. UVB light helps convert cholesterol in the skin into pre-vitamin D, but the deeper story is that vitamin D behaves like a transcription factor with “top secret access” to the nucleus, influencing hundreds of genes. Then we zoom out to what most people miss: blue light around 480 nm sets circadian rhythm through melanopsin receptors in the retina, UVA can mobilise nitric oxide to support blood flow and cardiovascular health, and red to near-infrared wavelengths interact with mitochondria through cytochrome c oxidase, shaping energy production, healing, and resilience.

Along the way we challenge the supplement-only mindset, explain why sunlight is self-regulating in ways pills are not, and explore why people often override what their bodies feel with what they have been told to fear. If you care about circadian health, vitamin D, nitric oxide, photobiomodulation, mitochondrial function, and the future of biophysics in medicine, this is the map we wish more people had.

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For slides and open source references: www.thehealthedgepodcast.com

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Bile might be the most overlooked substance in everyday health, yet it sits at the crossroads of digestion, detoxification, and metabolic control. We take a fresh look at bile quality and bile acids, starting with what the liver makes from cholesterol, what the gallbladder stores, and what gets released when we eat, especially after higher fat meals. From there, the story gets far more interesting: bile acids don’t just help you absorb fat, they also communicate with receptors in the gut and throughout the body in ways that can affect appetite, energy expenditure, insulin sensitivity, lipid patterns, and inflammation.

We also unpack enterohepatic circulation, the recycling loop where roughly 95% of bile acids can be reabsorbed and sent back to the liver. That matters for anyone thinking about detoxification, because bile is a major exit route for fat-soluble toxins, and without the right binders those compounds can circle back. We talk through the practical role of soluble fibre, including beta-glucan and pectin, and why the source matters when you’re balancing bile binding with blood sugar control.

The gut microbiome is the other half of the equation. Your bacteria convert primary bile acids into secondary bile acids, and that conversion can shift bile toward more inflammatory or more protective effects. We connect modern dysbiosis drivers like low fibre intake and antibiotic exposures with downstream bile changes, then get specific about foods that support thinner bile (extra virgin olive oil, flax, black seed oil, oily fish, avocado, nuts) and foods that often do the opposite (refined carbs and fried oils heated to high temperatures). If you’ve ever wondered why fried meals so often precede gallbladder pain, we explain the mechanism in plain language.

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Sunscreen advice usually comes as a binary: fear the sun or ignore the risks. We take a different path and give you a practical framework for sun protection that doesn’t sacrifice the real health benefits of sunlight. From the start, we separate the roles of UVA and UVB so you can understand what actually causes sunburn, what drives vitamin D production, and why UVA is linked with skin aging while still playing a role in nitric oxide release and circulation.

Then we get concrete about “sensible sunlight exposure,” a balanced approach popularised by vitamin D researcher Dr Michael Holick. We talk about how timing, latitude, altitude, season, and skin pigmentation change your safe window for unprotected sun, and why regular gradual exposure can build a “solar callus” that improves tolerance. We also cover a detail many people miss: most household glass blocks UVB but allows UVA through, which matters for anyone spending long hours near windows or on the road.

Finally, we tackle sunscreen safety and label reading. We discuss concerns around common sunscreen chemicals like parabens and benzophenone-3 (often called oxybenzone), the reality of transdermal absorption with frequent reapplication, and why combining products can amplify exposure, especially when sunscreen overlaps with insect repellent. We share how we use the Environmental Working Group (EWG) tools like the Skin Deep app, clarify what SPF and “broad spectrum” really mean, and name the mineral sunscreens we trust, with an emphasis on zinc oxide and non-nano options.

If this helps you rethink your summer routine, subscribe, share the show with a friend, and leave a review so more people can find smarter, safer guidance on sunlight, sunscreen, and skin health.

Environmental Working Group: ewg.org

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Your supplement shelf can turn into a silent monthly subscription, and the scariest part is not the cost. It’s the uncertainty. We sit down to unpack why supplements so often feel like a black box, how isolated nutrients can behave differently than nutrients in whole foods, and what a sensible, evidence-based supplement routine looks like when you care about real outcomes like strength, metabolic health, energy, and long-term resilience.

We walk through the decision filters we use as clinicians, starting with the most straightforward case: measured deficiencies you can actually track, like vitamin B12 or vitamin D. From there, we share John’s “Four I’s” checklist (imbalance, insufficiency, infection, isolation) and why the food matrix matters so much when you’re deciding between a capsule and a plate. We also get specific about common scenarios, including vegan and plant-based nutrient gaps (especially zinc and B12), aging and fatty acid needs, and why omega-3 fish oil studies can look mixed compared with the consistent benefits of eating oily fish.

We dig into risks that don’t get enough airtime, including supplement overload, vitamin toxicosis concerns, and medication-driven nutrient depletion. Metformin and B12, statins and CoQ10, and proton pump inhibitors and mineral absorption all come up, along with a bigger theme: changing a biomarker is not the same as improving an outcome. To keep things grounded, we share what we actually take right now, why creatine has one of the strongest evidence bases in sports nutrition and healthy aging, how creatinine lab values can be misread, and where berberine and targeted probiotics like Akkermansia may fit for metabolic health when paired with lifestyle changes. We close with practical tips on supplement quality and third-party testing, plus how to build a short-term “bridge” plan with clear stop rules.

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For video recording and open source reference articles: www.thehealthedgepodcast.com

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Your body keeps time, and your fork might be one of the strongest signals it listens to. We get into chrononutrition, the growing science of meal timing, and why aligning breakfast and dinner with circadian biology may change far more than your waistline. Using a new large-cohort analysis from NHANES, we talk through how first meal time, last meal time, and the length of your daily eating window correlate with biological aging models, including organ-specific aging patterns in the heart, liver, and kidneys.

We also make the research practical. We share why late dinners and long grazing-style eating windows can push you toward insulin resistance, weight gain, and worse sleep, and why shutting down food earlier in the evening often becomes the “linchpin” habit that makes everything else easier. Then we zoom in on breakfast strategy, including why a high-protein, higher-fat morning meal can improve satiety, muscle protein synthesis, thermogenesis, and energy through the day, plus examples of simple high-protein breakfasts you can actually repeat.

Finally, we explain biological age testing in plain language. We compare epigenetic clocks based on DNA methylation with functional blood-based models like KDM and PhenoAge, and why trending these markers can motivate real behavior change. If you care about healthy aging, metabolic health, time-restricted eating, better sleep, and a routine that works with your biology instead of against it, this conversation gives you a clear place to start. Subscribe, share this with someone you care about, and leave a review with the meal-timing change you’re willing to try this week.

For video, slides and open source research articles: www.healthedgepodcast.com