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Longevity with Criteria

Longevity with Criteria

By: José María Castillejo
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Do you feel that the harder you look after yourself, the worse you feel? This podcast explains how your body really works, from biophysics, physiology and common sense, so that you live more years and, above all, better. No fads, no fear, no excess. Your body is, first of all, an electrical system: cells with voltage, membranes with polarity, and a network of connections that needs well-structured water, sunlight and the minerals of unrefined salt to hold its charge and its balance. When that connectivity is lost, fatigue, inflammation and premature ageing appear; when it is cared for, the body repairs itself every single day. In each episode, José María Castillejo takes apart a health belief that sounds logical but wears you down, and replaces it with the right dose you can apply from tomorrow morning: water, sun, salt, temperature, movement, the plate, rest and emotion. New episodes every week.© 2026 José María Castillejo Hygiene & Healthy Living Physical Illness & Disease Science
Episodes
  • YOU WAKE UP WITH A CRAMP. And it's not lack of magnesium

    YOU WAKE UP WITH A CRAMP. And it's not lack of magnesium
    29 Sep 2026
    It's three thirty in the morning and a calf cramp wakes you up. You tell your leg to stop and it ignores you, because the order doesn't start there. I'll show you where it comes from, and why magnesium doesn't shut it down. You suddenly wake up with a cramped calf, a leg as hard as rock, and that feeling that the muscle doesn't belong to you. Nighttime leg cramps happen to a third of people over sixty and half of those over eighty, and almost everyone jumps to the same unverified conclusion: that they're low on magnesium, or not drinking enough water. In this video, I'll show you why those two explanations fall apart when you look at clinical trials, and what is really happening inside you at three thirty in the morning. The signal that locks up your calf isn't generated in the muscle. It comes from an alpha motor neuron housed in the anterior horn of the spinal cord, firing action potentials at a frequency measured in hertz, triggering the cramp only when it crosses a specific threshold. In 2011, a team led by Marco Minetto measured that threshold in eight healthy men and then anesthetized the posterior tibial nerve with lidocaine—essentially cutting the return wire between the muscle and the spinal cord. With the nerve intact, the cramp lasted an average of 55.6 seconds. With the nerve blocked, 2.6 seconds. The exact same discharge, the same muscle, and the same man, but with the feedback loop interrupted: what keeps a cramp going over time doesn't live in your calf; it lives in the loop connecting your muscle spindles to your spinal cord. And that leads to what you actually can do tonight. The only thing proven to reduce cramp frequency in a controlled trial is a stretch targeting two specific muscles, done every night before bed: eighty people averaging seventy years old, six weeks, and 1.2 fewer cramps per night. The second factor is your medicine cabinet, as common medications often appear in patient histories right before cramps start, with bronchodilators leading the list. None of this is medical advice to stop any treatment on your own—it's information so you can ask your doctor with the data right in front of you. 🎯 Why you tell your leg to stop and it doesn't obey you 🎯 What five trials on magnesium and cramps say, and what actually came out of them 🎯 The anesthetized nerve experiment: from 55 seconds to two and a half 🎯 The doorframe test, so you can check it on your own body 🎯 The stretch that actually works: which two muscles, and how often 🎯 The medications that show up in patient histories before cramps do Key concepts alpha motor neuron, anterior horn of the spinal cord, cramp threshold frequency, lidocaine nerve block, muscle spindles, Kohnstamm phenomenon, serum magnesium Scientific evidence consulted Mechanisms of cramp contractions: peripheral or central generation? Minetto MA, Holobar A, Botter A, Ravenni R, Farina D. https://doi.org/10.1113/jphysiol.2011.212332 Magnesium for skeletal muscle cramps. Garrison SR, Korownyk CS, Kolber MR, Allan GM, Musini VM, Sekhon RK, Dugré N. https://doi.org/10.1002/14651858.CD009402.pub3 💎 This channel exists to remain independent. Members are the ones who make it possible. They get access to a closer community and vetted resources handpicked one by one by José María. If you'd like to take that step: https://www.youtube.com/channel/UCDUt4dfNs1YD0ELwOx4dPLg/join 📺 This video is part of The Electric Body series. TABLE OF CONTENTS: 00:00 You tell your leg to stop and it ignores you 01:12 The signal doesn't come from your calf: it comes from your back 04:12 Why drinking more water won't fix your cramps 06:20 Magnesium and cramps: what five trials show 09:22 What magnesium is actually good for, if not this 10:17 Where the signal that locks up your calf comes from 13:10 The anesthetized nerve experiment: from 55 seconds to 2.5 16:08 What a motor neuron is and why it controls your muscle 18:39 The doorframe test: try it yourself 21:10 Why your arms rise on their own: the Kohnstamm phenomenon 27:40 The stretch that actually works: two muscles, every night 40:43 Medications that appear in your history before cramps do
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    49 min
  • NOTHING AGREES WITH YOU ANYMORE. An organ aging 10 years sooner

    NOTHING AGREES WITH YOU ANYMORE. An organ aging 10 years sooner
    29 Sep 2026
    There is an organ that reaches its tipping point ten years earlier than your brain, and it determines how things agree with you, how you sleep, and how you start your morning. It isn't your brain: it's your liver. And what sets its rhythm is in your hands. After forty-five, things no longer agree with you the same way. Two glasses of wine are felt the next day, afternoon coffee disrupts your sleep, and on some mornings your body takes longer to get going. The explanation we all reach for is age, and underneath it, an assumption we accept without ever looking at it closely: that the entire body ages all at once, as if there were a single clock inside for everything. It doesn't work like that. There is a clock for each organ, and they don't all show the same time. In a study published in Cell in 2026, a team from the Institute of Zoology of the Chinese Academy of Sciences measured over two hundred and forty parameters in two thousand nineteen healthy individuals aged eighteen to ninety-one, constructing six distinct proteomic clocks—one per organ. The liver reaches its tipping point around age forty; the brain, around fifty. The clotting factors produced by the liver—F13B, F9, and F10—accumulate in plasma with age, and F13B induced senescence markers in cultured human aortic endothelial cells and accelerated aging of the liver, heart, aorta, and kidneys when injected into mice. And there is a second oscillator that almost no one talks about: the liver's circadian clock isn't synchronized by light—it's synchronized by food, something demonstrated in an animal model. From this emerge four cost-free levers you can start adjusting tomorrow: how many times a day you activate this organ, what time you close the kitchen, going to bed and waking up at the same time, and walking in moderation. Plus a three-day protocol, using just paper and pen, to see in writing where you stand. No juices, no kits, and no brands. 🎯 Why the liver reaches its steep decline about ten years before the brain 🎯 The two age windows where everything accelerates: from 40 to 50 and from 60 to 70 🎯 Why wine seems to agree more with daily drinkers, and what is actually happening inside 🎯 What originates in an aging liver, travels through the blood, and reaches other organs 🎯 Why your liver cells are less than three years old, regardless of your age 🎯 The four levers and the three-day log to start tonight Key concepts: multi-organ proteomic clocks, hepatic tipping point, F13B clotting factors, endothelial senescence, acetaldehyde and CYP2E1, hepatic circadian clock, hepatocyte regeneration Scientific evidence consulted: Multimodal clocks of human aging. Li J, Jiang B, Zhang W, Qu J, Liu GH. Cell, 2026. https://doi.org/10.1016/j.cell.2026.04.025 Nonlinear dynamics of multi-omics profiles during human aging. Shen X, Wang C, Zhou X, Snyder M. Nature Aging, 2024. https://doi.org/10.1038/s43587-024-00692-2 💎 This channel exists to remain independent. Members are the ones who make it possible. They get access to a closer community and verified resources selected by José María. If you want to take that step: https://www.youtube.com/channel/UCDUt4dfNs1YD0ELwOx4dPLg/join 📺 WATCH THE COMPLETE SERIES: The Liver ▶️ Video 1: YOU DON'T NEED TO DETOX YOUR LIVER: What Science Really Says (Link: https://youtu.be/sX5eC63E9Sg) ▶️ Video 2: NOTHING AGREES WITH YOU ANYMORE. Your Longevity Depends on an Organ Aging 10 Years Sooner (You are watching this one) TABLE OF CONTENTS: 00:00 Three signs that appear after fifty 01:11 You don't have one clock: you have one for each organ 02:02 Why wine seems to agree better with daily drinkers 08:13 Why the liver, and how individual organ age is measured 10:15 The liver accelerates at forty, ten years before the brain 11:54 What an aging liver releases into the rest of the body 14:20 The liver begins aging before the brain: the two age windows 16:25 Stanford: Aging milestones at age 44 and 60 20:56 The liver's clock follows your meal times, not light 24:09 Frequent meals, smoking, and poor sleep accelerate aging; fruit, consistent sleep, and walking slow it down 31:49 An organ doesn't age at the pace of its cells: your liver cells are under three years old 37:11 The four levers to slow down your liver's clock 42:28 What you can do today: keep a paper log for three days
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    45 min
  • FRUCTOSE IS FILLING YOUR LIVER WITH FAT. And you haven't even noticed

    FRUCTOSE IS FILLING YOUR LIVER WITH FAT. And you haven't even noticed
    1 Oct 2026
    Your blood sugar test comes back fine, yet you are still told you have fatty liver. The fructose from orange juice, honey, and agave doesn't show up on that lab test. Here is where it goes and what to do tomorrow. You get your blood work done every year, your glucose levels look good, and then one day an ultrasound shows fat in your liver. You did what you were supposed to do: you cut out the sugar bowl, sodas, and pastries, replacing them with fresh orange juice, honey, and agave syrup. But sugar is actually two molecules: glucose and fructose, and fructose doesn't have a spot on your lab report. If you wonder whether orange juice is actually good for you, or why non-alcoholic fatty liver happens in people who take care of themselves, this video is about that. The small intestine acts as the first filter for fructose, and that filter has a limited capacity: roughly the amount found in one piece of chewed fruit (Princeton University, 2018). A glass of juice is two or three oranges without their fiber, drank all at once. Whatever overflows the filter travels up the portal vein straight to the liver, entering a pathway that bypasses the brake regulated by insulin and accelerating de novo lipogenesis—the creation of new fat from sugar. At the University of California, Davis, in adults aged 40 to 72, ten weeks of beverages with added fructose (not juice, but pure sugar, accounting for a quarter of daily calories) increased visceral fat by 14% and worsened insulin sensitivity, with the same weight gain as the glucose group. When fructose replaces another carbohydrate instead of being added to it, trials do not see that damage: the difference lies in adding versus substituting. That process explains about a quarter of the fat in a fatty liver, not all of it (a small study of nine people: this is an approximate breakdown). But it is the only part you can change tomorrow morning: whole oranges, peeled and chewed instead of juice, and at least two pieces of fruit per day. Honey and syrups belong in the same category as juice. If you use juice to recover from a low blood sugar crash, or if you are underweight, keep that glass. And if you take insulin or medications that can lower your blood sugar, talk to your doctor before cutting it out. Whether fructose damages knee cartilage has only been measured in a test tube; it has not been proven in humans. 🎯 Why your blood test looks normal and misses fructose 🎯 Fructose and glucose: the two molecules you call sugar 🎯 The intestine's limit: a chewed orange is not a glass of juice 🎯 How fructose accelerates fat production in the liver 🎯 The three sources of fat in a fatty liver 🎯 Visceral fat and insulin in ten weeks: fructose added vs substituted 🎯 What to do with juice tomorrow, and who this is not for Key concepts fructose, portal vein, de novo lipogenesis, visceral fat, insulin sensitivity, fatty liver, free sugars Scientific evidence reviewed The Small Intestine Converts Dietary Fructose into Glucose and Organic Acids. Jang C, Hui S, Lu W, Cowan AJ, Morscher RJ, Lee G et al. https://doi.org/10.1016/j.cmet.2017.12.016 Consuming fructose-sweetened, not glucose-sweetened, beverages increases visceral adiposity and lipids and decreases insulin sensitivity in overweight/obese humans. Stanhope KL, Schwarz JM, Keim NL, Griffen SC, Bremer AA, Graham JL et al. https://doi.org/10.1172/JCI37385 00:00 Normal blood test results and still fatty liver 01:28 Fresh orange juice, honey, and agave syrup: the change that seemed healthy 03:52 Fructose and glucose: sugar is two molecules 06:06 Why fructose does not show up on your blood test 07:25 The intestine filters fructose, but it has a limit 10:32 Is fresh orange juice good for you? Two or three oranges at once 12:19 Fructose reaches the liver and bypasses insulin control 17:06 Does fructose turn into fat? Where liver fat comes from 23:56 Visceral fat and insulin resistance in ten weeks 31:28 Agave syrup and children: two facts that failed verification 34:30 What to do with juice tomorrow: 3 basic rules 37:50 Does fructose damage knee cartilage? And what comes next: uric acid
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    42 min
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