The Randle Cycle: How Your Body Chooses Between Glucose and Fat

In this episode of The Metabolic Classroom, Dr. Bikman introduces the concept of the Randle Cycle, also known as the glucose fatty acid cycle, in a lecture aimed at providing a better understanding of metabolism. The Randle Cycle, first identified by Dr. Philip Randle and his colleagues in the 1960s, explores how cells decide between using glucose or fatty acids for fuel. Dr. Bikman emphasized that this cycle has been misinterpreted on social media and aims to clarify its relevance in metabolic functions and nutritional decisions.

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00:00 - Introduction to the Metabolic Classroom and Dr. Ben Bikman

01:00 - Overview of the Randle Cycle (Glucose Fatty Acid Cycle)

02:00 - Historical Background: Philip Randle’s Research

03:00 - Experimental Model: Perfused Rat Hearts

04:00 - Key Terms: Glucose and Fatty Acids

05:00 - Concept of Substrate Competition

06:00 - Reciprocal Inhibition: Fats vs. Glucose

08:00 - Fatty Acid Oxidation Process

10:00 - Biochemical Pathways: Acetyl-CoA, NADH, and Pyruvate Dehydrogenase

12:00 - Role of Citrate in Glycolysis Inhibition

14:00 - Glucose Utilization and Malonyl-CoA

16:00 - Insulin’s Role in Fuel Selection

18:00 - Insulin’s Impact on Glucose and Fat Burning

20:00 - Diabetes Case Study: Type 1 and Type 2

22:00 - Type 1 Diabetes: High Glucose and Fatty Acids

24:00 - Ketones Production in the Liver

26:00 - Type 2 Diabetes: Insulin Resistance and Metabolic Inflexibility

28:00 - Insulin Resistance in Fat Cells

30:00 - Metabolic Inflexibility in Type 2 Diabetes

32:00 - Insulin Resistance in the Brain

34:00 - The Impact on Hunger and Neurological Disorders

36:00 - Conclusion: Importance of Insulin in Metabolic Health

#Metabolism #RandleCycle #DrBenBikman #InsulinResistance #GlucoseMetabolism #FattyAcidOxidation #MetabolicHealth #DiabetesResearch #Ketosis #Type1Diabetes #Type2Diabetes #InsulinRole #CellBiology #NutritionalScience #MetabolicFlexibility #Ketones #GlucoseUtilization #FatBurning #BiomedicalScience #HealthLecture

My favorite meal-replacement shake: https://gethlth.com (discount: BEN10)

My favorite electrolytes (and more): https://redmond.life (discount: BEN15)

My favorite allulose source: https://rxsugar.com (discount: BEN20)

References:

https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/randle-cycle

Insulin Regulation of Ketone Body Metabolism: https://onlinelibrary.wiley.com/doi/10.1002/0470862092.d0308

The Effects of a Ketogenic Diet and Exercise Interventions on Cognitive Function: https://faseb.onlinelibrary.wiley.com/doi/10.1096/fasebj.31.1_supplement.lb810

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