Earlier quoted context omitted.
So a probably safe comparison is Ironmans or Ultramarathons (100 milers go for 17-18 hours for the top finishers). Usually you have to put in a huge amount of carbs per hour (50-80g/hr) and a high amount of calories (250-400 cal/hr). Hydration is obviously also very important and getting sodium will be key (1000mg/hr). Outside of that you can generally limit your body's usage of fat stores though at this length and t…
I wonder if losing weight over the course of the run itself means that it got easier for him to move near the end (of course offset by the tiredness/fatigue) - I wonder if the effect did slightly cancel out?
You need some amount of weight for muscle to push your body forward and I don't know that there is a big aerodynamic or energy advantage to sacrificing weight for that.