Metabolismo energético V - Flexibilidad metabólica

In this episode of Let's Talk About Physiology, we explore one of the most fascinating questions in human metabolism: if mitochondria don't have a brain… how do they decide which fuel to use during exercise? We discuss the regulation of fat and carbohydrate use, the role of exercise intensity, and how hormonal and cellular signals determine which energy substrate predominates at any given time. We review the classic glucose-fatty acid cycle proposed by Philip Randle and how we now understand that metabolism doesn't function as a simple competition, but as an integrated and dynamic system. We also connect these concepts with the historical contributions of August Krogh and Otto Warburg, who helped lay the foundations of modern metabolic physiology. Furthermore, we delve into: The role of AMPK as a “metabolic switch” How exercise intensity modifies fuel choice What metabolic flexibility really is Why training improves energy adaptation capacity What happens in insulin resistance and rigid metabolism This episode is key to understanding athletic performance, metabolic health, obesity, diabetes, and aging from an integrated physiological perspective. Because ultimately, mitochondria don't choose… they respond. And that response depends on the body's ability to adapt.