『50. Glucose Is the Most Efficient Fuel | The ATP & Metabolism Science Explained (Part 1)』のカバーアート

50. Glucose Is the Most Efficient Fuel | The ATP & Metabolism Science Explained (Part 1)

50. Glucose Is the Most Efficient Fuel | The ATP & Metabolism Science Explained (Part 1)

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What if the most efficient fuel for the human body isn't fat… but glucose? In this episode, Zane Griggs breaks down the actual biochemistry behind ATP production, mitochondrial efficiency, and why cardiologists actively try to shift failing hearts away from fat oxidation and back toward glucose oxidation. This conversation dives deep into the P/O ratio, oxygen efficiency, insulin resistance, heart failure, ketones, metabolic flexibility, and the misunderstood role of glucose in human metabolism. If you've been told that fat is always the superior fuel source, this episode may completely change how you think about metabolism, performance, and energy production. In this episode: Why glucose produces more ATP per oxygen moleculeThe truth about fat oxidation vs glucose oxidationWhy the heart becomes "stuck" burning fat in heart failureThe real meaning of metabolic flexibilityWhy insulin is not the villain it's been made out to beThe difference between glycolysis and glucose oxidationWhy ketones are not the "super fuel" many claimHow mitochondrial inefficiency impacts metabolic diseaseThe connection between diabetes, heart disease, and fuel selection This is Part 1 of a deeper metabolic series exploring insulin resistance, ATP production, glucose metabolism, and how the body actually creates energy. Feeling "off" despite doing everything right? Download Zane's free Metabolic Stress Marker Guide to learn: ✔ what your labs may actually be telling you ✔ why "normal" doesn't always mean optimal ✔ the hidden hormone, thyroid, and metabolic markers most people overlook 👉 Get the free guide: https://zanegriggs.com/freeguide Ready to learn more? Get Zane's Free Over 40 Performance Plan: https://free40plan.com 00:00 Why fuel efficiency matters 01:00 What is ATP and the P/O ratio? 02:00 Why oxygen efficiency changes everything 03:00 Calories vs mitochondrial efficiency 05:00 The engine analogy explained 06:00 The studies comparing glucose, fat, and ketones 08:00 Why glucose creates more ATP than fat 09:00 What happens in heart failure 11:00 Are ketones really a "super fuel"? 13:00 Ketones and mitochondrial uncoupling 14:00 How cardiologists use glucose therapeutically 16:00 Fat oxidation and heart dysfunction 18:00 Diabetes, heart disease, and blocked glucose oxidation 20:00 Why doctors shift patients toward glucose oxidation 22:00 The metabolic flexibility explanation 24:00 Fat oxidation blocking glucose oxidation 25:00 Why insulin is NOT the enemy 27:00 The real driver of insulin resistance 28:00 Key takeaways on glucose vs fat burning 30:00 Preview of Part 2 Mookerjee et al. (2017) "Quantifying intracellular rates of glycolytic and oxidative ATP production and consumption using extracellular flux measurements" Journal of Biological Chemistry — PMC5409486 Used for: Glucose P/O ratio of 2.79; updated theoretical maximum ATP yields Agilent Technologies / Seahorse Bioscience (white paper) "Quantifying ATP Production Rate Using the Seahorse XF Real-Time ATP Rate Assay" Agilent application note 5991-9303EN Used for: P/O ratio range — palmitate 2.45, glucose 2.79–2.86; average cellular P/O of 2.75 Lopaschuk, Ussher, Folmes, Jaswal, Stanley (2010) "Myocardial Fatty Acid Metabolism in Health and Disease" Physiological Reviews — PMC3976623 Used for: All four extended quotes on fat oxidation dominance in heart failure, ischemia, and diabetes; therapeutic strategy of reducing fat oxidation and increasing glucose oxidation Fillmore, Jaswal, Lopaschuk (2011) "Uncoupling of glycolysis from glucose oxidation accompanies the development of heart failure" ScienceDirect / Journal of Molecular and Cellular Cardiology Used for: Quote on pharmacological shifting from fat to glucose oxidation improving ATP efficiency; cardiac ischemia and heart failure Sun, Lopaschuk et al. (2024) "Mitochondrial fatty acid oxidation is the major source of cardiac ATP production in heart failure with preserved ejection fraction" Cardiovascular Research, Volume 120 — PMID 38193548 Used for: HFpEF data — suppressed insulin-stimulated glucose oxidation, increased FAO, decreased PDH phosphorylation in mouse and human samples Kolwicz (2021) "Ketone Body Metabolism in the Ischemic Heart" Frontiers in Cardiovascular Medicine — DOI 10.3389/fcvm.2021.789458 Used for: Ketone P/O ratio ~2.50 vs glucose ~2.58 vs fat ~2.33; ischemic heart disease ketone data; KD associated with worse outcomes post-MI in some models MDPI / Koutnik et al. (2020) "Ketones Elicit Distinct Alterations in Adipose Mitochondrial Bioenergetics" International Journal of Molecular Sciences — DOI 10.3390/ijms21176255 Used for: β-hydroxybutyrate increases respiration without commensurate ATP production; elevated O2:ATP ratio confirming uncoupling; UCP1 and PGC1α upregulation Sullivan et al. / ResearchGate (2004) "The Ketogenic Diet Increases Mitochondrial Uncoupling Protein Levels and Activity" Used for: Ketogenic diet increases hippocampal ...
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