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Ultra-runners end up with a very efficient fat-burning metabolism and a very good idea of what food works for them. Fundamentally, you physically cannot take in enough calories to keep up with the energy expended so your body must switch to burning fat. (There is a maximum gastric emptying rate; combine that with the need for the fluids to be at the same ...


There's a swedish runner called Rune Larsson (2:18 boston marathon), had the swedish record on 100 km (6:43:36) for 22 years, ran 374 km in 48 hours, 263 km in 24 hours, basically a very experienced ultra marathon runner. His take on food is that most runners are too scared of trying things outside the norm, you don't have to eat enormous amounts of pasta ...

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