Alex McDonald is an endurance athlete who defied conventional wisdom by running five consecutive marathons completely fasted. Despite facing skepticism and negative feedback from family and friends, Alex persisted with conviction and thorough preparation. Seeking advice and support from esteemed medical professionals like Dr. Paul Mason and Dr. Ian Lake, Alex meticulously documented his journey, combating injuries and enduring extreme heat, all while relying on fat reserves for energy.

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Website: Ketomarathons.com

Timestamps: 00:00 Trailer. 00:57 Introduction. 04:05 Running marathons solo. 08:39 Strict carnivore diet and endurance. 11:43 14% body fat. 13:52 Marathon with low heart rate. 16:00 Fat adaptation. 20:01 Anti-inflammatory use and fluid retention. 22:27 Impact of low-carb diets on endurance. 25:10 Five-day fast. 27:08 Fast ketone utilization, easier recovery. 31:37 Mental fortitude. 33:42 Fasting vs. starvation. 36:11 Running fasted. 38:45 Feedback negative. 43:12 Heat and higher heart rate zones. 47:05 Fat efficiency for energy and endurance. 48:40 Diabetic endurance athletes. 51:25 Where to find Keto Marathons.

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Running On Empty: Five Marathons Fasting Journey | Dr. Shawn Baker & Alex McDonald