{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"Board Pearls","title":"Chapter 32, Ep 3 of 4: Fat-Soluble and Water-Soluble Vitamins","html":"","width":"100%","height":180,"duration":1255,"description":"Episode three reads the vitamins the way the boards test them, where every micronutrient produces a stereotyped phenotype that is the recognition cue on a stem. Behind each cue is a biochemical mechanism, and the same mechanism predicts the at-risk population and the replacement strategy. Memorizing the symptom list is the wrong frame; learning the mechanism lets the phenotype, the population, and the treatment fall out of it. The fat-soluble vitamins share a bile-salt absorption requirement, and the water-soluble vitamins carry the acute decisions, thiamine before glucose and B12 before folate.\n \nTopics covered\n\nBile-salt requirement for fat-soluble vitamins\nVitamin A night blindness and toxicity\nVitamin D metabolic bone disease\nVitamin E neuropathy, hemolysis, and NASH\nVitamin K, warfarin, and the NPO patient\nEssential fatty acid deficiency\nThiamine and Wernicke encephalopathy\nB12 absorption steps and pernicious anemia\nB12-versus-folate masking trap\n \nKey decisions\n\nAnything that disrupts the enterohepatic bile-acid cycle, cholestyramine, cholestasis, ileal disease, cystic fibrosis, or unsupplemented parenteral nutrition, deletes all four fat-soluble vitamins plus essential fatty acids.\nChronic vitamin A intake above roughly fifty thousand international units per day activates hepatic stellate cells into myofibroblasts and produces perisinusoidal fibrosis and portal hypertension, while a single large dose instead causes pseudotumor cerebri.\nVitamin E at eight hundred international units daily improves histology only in non-diabetic biopsy-proven NASH, and extension beyond that phenotype is unsupported given increased prostate cancer and hemorrhagic stroke risk at high doses.\nAn NPO patient on warfarin started on broad-spectrum antibiotics spikes the INR within days because both dietary and colonic bacterial vitamin K sources are eliminated at once.\nMedium-chain triglyceride oil cannot prevent essential fatty acid deficiency because its eight-to-twelve-carbon...","thumbnail_url":"https://img.transistorcdn.com/-FuAdDBcPDLhEoUmroZKtOBRvuBn_FHPpYlh41hOnU4/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9iNzlh/ZTU4Y2MzNWExMjQ5/MjA5OWMwMmI3ZTk5/NGFiZS5wbmc.webp","thumbnail_width":300,"thumbnail_height":300}