http://www.westhighlandwayrace.org/R...al_advice.html

Thanks for reminding me - I have read this before but had forgotten about it. I must say it seems to be excellent advice and certainly fits in with my understanding of weight change and fluid requirements in long events in a relatively cool climate. Triathlons in Hawaii are of course a different matter, as are military scenarios where the duration/level of exertion/access to fluid/calories are all unknowns.