I gave blood last week and forgot that it takes a while to get all that stuff back to normal but I still gave the 400K a try. I managed to finish in 24.5 hours but it wasn't very much, felt like I was pulling a trailer the entire time. It was lovely weather compared to my last attempt... I've never seen so many fireflies in my life. About 7500 feet of climbing but most of it was over the first 250km or so. I made up some maltodextrin/soy protein mix (perpetuem knockoff) and that seemed to keep me going for about half of my food but I ate a bunch of other crap along the way and I think the only thing that was a good choice was a veggie burger for dinner and a few bags of salted cashews to snack on. I don't really feel like doing a 600K right now but who knows.