The Runner's Fuel: Why Carbs are King.Carbohydrates are quickly converted to glucose, the body's primary energy sourceGlucose is stored in muscles and liver as glycogen, which fuels intense exerciseRunning depletes glycogen stores, making carb intake crucial for performanceThe Mental Game: How Carbs Affect Your Running Psychology.Carbs influence serotonin production, affecting mood and motivationProper fueling can prevent the dreaded "bonk" or "hitting the wall"Mental clarity and focus improve with adequate carb intake