The Role of Insulin Resistance

Insulin resistance is identified as a central cause of various chronic metabolic diseases, including heart disease, diabetes, and even cancer and dementia. Dr. Lustig emphasizes that a high fasting insulin level is a key indicator of metabolic health, noting that 93% of Americans exhibit some form of metabolic dysfunction. He stresses the importance of the fasting insulin test, which many individuals are unaware of due to a lack of awareness among both patients and doctors. Understanding insulin's function is crucial, as it directs energy use in the body, and when it becomes resistant, it leads to increased fat storage and obesity.