5 Marathons in 5 Days Fuelled only with Water with Alex McDonald

In this episode of Chief Life, we sit down with Alex McDonald, who completed an incredible feat—running 5 marathons in 5 consecutive days while fasted, consuming only water and electrolytes. Alex has been following a low-carb diet for 14 years and a strict carnivore diet for the past five, challenging conventional wisdom on endurance fueling. We discuss:Why he chose to run 5 marathons fastedHis transition from keto to carnivore and how it impacts his performanceTraining, nutrition, and preparation for extreme endurance challengesHow his body responded—blood markers, body composition, HRV, and recoveryThe role of fat adaptation in endurance performance and whether carb-loading is necessary Alex shares his key takeaways from the experiment and whether he plans to take on more endurance challenges in the future. If you’re curious about low-carb endurance performance or considering testing your own limits, this episode is packed with insights!https://www.instagram.com/ketomarathons/https://www.ketomarathons.com