I made the mistake once of referring to it as "boinking" my 17 year old racer and his buddies were most amused.......

Women do not store glycogen the same way men do, and they store less of it. Glycogen is the extra stuff you eat that your body thinks it still needs or will neeed later. It is stored in the liver. Men have a higher capacity to convert and store glycogen. The more active you are, and the better you eat, the more efficient your body will become over time at storing glycogen.

Staying up very late or being sleep deprived is a HUGE glycogen depleter - so be sure and eat a little more even if you have lost sleep in the past few days. Your liver does the glycogen converting and storing at night while you are sleeping.

My son gets out there and rides like 160 miles with nothing more than water and some sports drink.

Not me - I GOTTA eat...even if its just a few jellybeans every so often to go along with the 1/2 oatmeal bar I have to eat at about the 20 to 30 mile mark.