Dr. Ignacio Cuaranta, a psychiatrist specializing in chronobiology and metabolic health, joins the show to explain why sleep and light exposure may be among the most powerful tools for mental health. He connects ultra-processed foods to disrupted mood, impulsivity, and afternoon energy crashes, reframing many “willpower” struggles as issues of biological rhythm. The conversation covers practical strategies like morning light exposure and time-restricted eating for stabilizing mood and reducing cravings.