The Right Time to Cut Rates

Next Monday, I once again get to lace up my shoes and join my friends from the Dana-Farber team in running the Boston Marathon.  This year will be particularly special, as both of our sons are also running the race.
One of the advantages of being an older member of the team, (and I can testify to plenty of disadvantages), is that you accumulate advice that you can share with younger members, particularly those who are running their first marathon.  One such piece of advice is to drink before you are thirsty and to eat before you are hungry.
By the time you are thirsty, when running a marathon, you are likely severely dehydrated and low on electrolytes, causing, at best, a sharp deterioration of your performance.  By the time you are hungry, your blood sugar will probably be too low, making the rest of the race slow and painful.  In short, in long-distance running, one key is to make decisions before it feels like you need too.