In this episode, Brian Passenti and Simon Guerard engage in a deep conversation with dietitian Alyssa Leib about the critical role of nutrition in endurance sports. They explore Alyssa's journey to becoming a dietitian, the importance of proper fueling for performance, and the science behind popular supplements like creatine and ketones. The discussion also covers the Morton bicarbonate system and its potential benefits for athletes. Throughout the conversation, they emphasize the need for evidence-based practices and the importance of understanding individual nutritional needs. In this conversation, the speakers delve into various nutritional supplements and practices relevant to endurance athletes. They discuss the efficacy of new supplements, particularly BCAAs, and the importance of proper nutrition for recovery and performance. The conversation also covers the debate surrounding pre-workout supplements, the strategies for effective carb loading, and the myths associated with fasted training. Throughout, the speakers emphasize the importance of fueling the body adequately to enhance performance and reduce injury risk.