I give myself 1 hour prior to leaving. I will eat 1 bowl of cereal, 2 toast, half grapefruit, small orange juice and 1/2 cup of coffee. Commute is 1 hour long, 11 miles, I'm hungry when I arrive at the office. I will have a cup coffee and donut then. I am not hungry when I first get up but if I would leave without eating I would be starving within 10 mins.