On my longer run, I’d usually be fairly glad to get to the end ... with the US and UK among the worst offenders ...

I pretty much gave up on eating after 35 miles of my ultra, which was not smart when I had three more hours of activity to fuel. I learned that I couldn’t be trusted to make smart decisions after that ...

Ultra runners endure pretty extreme conditions ... and other carb-loaded meals. As a result, that food will sit around undigested, causing problems. But if your stomach isn't slowing you down ...