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Video library· Doctor Alex Audio: British English

Fasting For 45 Days. Here’s What Happens…

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About this video

Creator description · original textText language: British English

Water fasting is being promoted online as a cure for everything from high blood pressure to insulin resistance and visceral fat. But what does the science actually show once you look beyond the dramatic before-and-after stories? In this video, I break down the physiology of prolonged fasting, the published research behind clinics like TrueNorth Health Center, and the bigger question that almost never gets discussed properly: whether extreme fasting actually outperforms a simple, sustainable whole-food lifestyle long term. We’ll look at what happens inside the body during multi-day water fasts, including ketosis, autophagy, visceral fat mobilisation, insulin reduction, and rapid blood pressure improvements. I also explore the evidence around long-term outcomes, the risks of unsupervised fasting, refeeding syndrome, muscle loss, electrolyte disturbances, and why many of the metabolic benefits disappear unless eating habits change permanently afterwards. Most importantly, I want to explain why the real problem driving modern disease is probably not the absence of prolonged fasting — but the rise of ultra-processed food, chronic overconsumption, poor sleep, inactivity, and constant eating across the day. What you’ll learn: -What happens metabolically during prolonged fasting -Why fasting rapidly lowers insulin and blood pressure -The truth about ketosis and autophagy -Why visceral fat drops quickly during fasting -What the long-term evidence actually shows -The risks of prolonged water fasting -What refeeding syndrome is -Why ultra-processed food is the bigger problem -The Mediterranean diet and longevity evidence -The simple fasting approach I actually recommend -Why consistency beats extremes for long-term health TIMESTAMPS: 00:00 – The fasting claims everyone is hearing 03:44 – Inside the fasting clinic 04:53 – What happens when you stop eating 08:34 – What the evidence really shows 10:41 – Why the benefits often fade 12:20 – The risks of prolonged fasting 13:50 – The real metabolic problem 17:32 – The diet with the strongest evidence 20:50 – The fasting approach I actually use 23:48 – Why the boring habits work best REFERENCES Medically supervised water-only fasting in the treatment of hypertension https://pubmed.ncbi.nlm.nih.gov/11416824/ The Effects of Prolonged Water-Only Fasting and Refeeding on Markers of Cardiometabolic Risk https://pubmed.ncbi.nlm.nih.gov/35334843/ Prolonged Water-Only Fasting Followed by a Whole-Plant-Food Diet Is a Potential Long-Term Management Strategy for Hypertension and Obesity https://pubmed.ncbi.nlm.nih.gov/39599745/ Efficacy and safety of prolonged water fasting: a narrative review of human trials https://pubmed.ncbi.nlm.nih.gov/37377031/ Is Fasting Superior to Continuous Caloric Restriction for Weight Loss and Metabolic Outcomes in Obese Adults? A Systematic Review and Meta-Analysis of Randomized Clinical Trials https://pubmed.ncbi.nlm.nih.gov/39458528/ Intermittent fasting for adults with overweight or obesity https://pubmed.ncbi.nlm.nih.gov/41692034/ Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses https://pubmed.ncbi.nlm.nih.gov/38418082/ Ultra-processed foods and risk of all-cause mortality: an updated systematic review and dose-response meta-analysis of prospective cohort studies https://pubmed.ncbi.nlm.nih.gov/40033461/ Ultra-processed food intake and risk of cardiovascular disease: prospective cohort study (NutriNet-Santé) https://pubmed.ncbi.nlm.nih.gov/31142457/ Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake https://pubmed.ncbi.nlm.nih.gov/31105044/ Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts https://pubmed.ncbi.nlm.nih.gov/29897866/ Adherence to Mediterranean diet and health status: meta-analysis https://pubmed.ncbi.nlm.nih.gov/18786971/ The effectiveness of the Mediterranean Diet for primary and secondary prevention of cardiovascular disease: An umbrella review https://pubmed.ncbi.nlm.nih.gov/39143663/ Mediterranean Diet and Mortality in People with Cardiovascular Disease: A Meta-Analysis of Prospective Cohort Studies https://pubmed.ncbi.nlm.nih.gov/34444786/ Blue Zones: Lessons From the World's Longest Lived https://pubmed.ncbi.nlm.nih.gov/30202288/ Reduction in the Incidence of Type 2 Diabetes with Lifestyle Intervention or Metformin https://pubmed.ncbi.nlm.nih.gov/11832527/ This video is for educational purposes only and should not replace medical advice from your own doctor. Prolonged fasting can be dangerous in certain medical conditions and should never be undertaken without proper supervision. #fasting #longevity #metabolichealth #insulinresistance #nutrition #health #preventativemedicine #mediterraneandiet #dralex #doctoralex

Doctor Alex · 27 min · Source published: 2026-05-20

Added to Harbor: 10/23/2026

Original on YouTube ↗

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