Know Your Physio How to Heal Your Gut: Postbiotics, Akkermansia & Why a Broken Gut Is a Broken Brain | Leaky Gut, SIBO & Longevity with Nathaly Marcus
This episode is for ambitious, health-driven people who want to optimize their body from the inside out and it makes the case that the most radical thing you can do for your brain, mood, and longevity isn't another nootropic or longevity supplement: it's fixing your gut. The science applies to anyone, but the framing throughout is high performers who feel "off" despite doing everything right.
Did you know that over 90% of your serotonin, much of your dopamine and GABA, and the BDNF that builds your neurons are stimulated in your gut and that a broken gut is, quite literally, a broken brain? In this episode, Andres sits down in person with Nathaly Marcus clinical nutritionist, functional-medicine pioneer, founder of the Bienesta functional medicine center, and author of Sano, salvaje y sabio (Healthy, Wild, and Wise) for a deep, practical masterclass on the gut microbiome, postbiotics, and the nervous system underneath it all.
Drawing on her own journey from three-and-a-half years of post-surgical pain, burnout, and "never enough" perfectionism to a philosophy of self-love, rituals over habits, and healing from gentleness instead of fear, Nathaly breaks down the 5 R's of functional medicine (starting with remove), why Akkermansia and butyrate are the quiet heroes of gut repair, and how postbiotics act as the "tools" your microbiome builds to talk to your brain, mitochondria, and hormones. She and Andres go deep on leaky gut and autoimmunity, SIBO and stress, the histamine surge more and more people are experiencing, and the longevity pathways FOXO, Klotho, Nrf2 you can switch on through epinutrients and smart discomfort.
Key Topics Discussed:
A Broken Gut Is a Broken Brain: Why the gut is the most important "agent of wisdom" in the body, and how inflammation there shows up as brain fog, anxiety, and low mood.
Postbiotics Explained: The artisan-and-tools (and garden) metaphor why postbiotics, not just probiotics, are the molecules that rebuild your gut lining, mitochondria, and brain.
Akkermansia & Butyrate: How this keystone bacteria feeds on mucin and polyphenols, why fasting lets the strongest species survive, and how butyrate lowers inflammation and lifts depression.
Leaky Gut & Autoimmunity: The zonulin story, what a GI Map reveals (IgA, calprotectin, gluten antibodies), and why Nathaly argues most autoimmune disease Hashimoto's, lupus, psoriasis, even Parkinson's begins in the gut.
SIBO, Stress & Digestion: How survival mode lowers betaine and stomach acid, feeds bacterial overgrowth, and wrecks absorption and why probiotics can sometimes make it worse.
Histamine Intolerance: Why so many people are suddenly reacting to coffee, leftovers, and sulfur-rich foods, the role of the DAO enzyme, and the SIBO and food-diversity roots underneath it.
Food Diversity Over Repetition: Why "marrying" one food every day drives sensitivities and inflammation, and how rotating protein, produce, and ferments restores biodiversity.
Fiber as the Forgotten Pillar: Why half your plate should be fiber, how to build to ~30g a day without bloating, and the inulin, pectin, resistant starch, and green-juice tactics to get there.
Longevity Pathways You Can Switch On: FOXO, Klotho, Nrf2, AMPK and sirtuins and the epinutrients (rhodiola, curcumin, cacao, astaxanthin, sulforaphane, omega-3, PC) plus hormesis that activate them.
Nervous System, Trauma & "I Am Enough": Why "I am safe and I am secure" is the foundational mantra, why motivation from fear leads to self-sabotage, and how rituals done from love not guilt become longevity.
Actionable Tips:
Start Your Day for Your Gut: Warm water with lemon and a little apple cider vinegar to stimulate digestive fire, then chia, flax, and a splash of olive oil to feed the gut lining a cleaner, lead-free alternative to psyllium.
Rebuild Before You Add: Remove first (foods, toxins, disruptors, and toxic relationships), repair with glutamine, butyrate, and aloe, then reintroduce ferments slowly a "tequila shot" of rotating kefir, not a jar of sauerkraut.
Feed Your Postbiotics: Prioritize polyphenols and prebiotics pomegranate, red/purple pigments, artichoke, asparagus, leek, onions, olive oil, and green tea to stimulate Akkermansia and butyrate.
Make a Rotating Green Juice: Greens plus a detox herb (cilantro/coriander, parsley) and a daily-rotated polyphenol powder (pomegranate, maqui, açai) instead of overpriced all-in-one greens powders.
Eat for Diversity, Not Efficiency: Rotate proteins, produce, seeds, and ferments through the week even "healthy" foods repeated daily can drive sensitivities and inflammation.
Mind the State You Eat In: Be present, chew thoroughly, don't drink water with meals (sip between them), and drop into rest-and-digest first because how you eat changes how your body absorbs it.
Do Hard Things on Purpose: Use temporary, intelligent discomfort sauna, cold, fasting, hard training to switch on FOXO, Klotho, Nrf2 and build a body that adapts to stress instead of breaking under it.
Test, Don't Guess: Get a GI Map and food-sensitivity testing before assuming the problem is willpower or mindset find your personal bottlenecks first.
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