I've done two runs before work, and learned a lesson each time. First, a single packet of Gu is not enough. Second, two packs of Gu at a time make my stomach feel sick while running.

What do you eat before a run -- particularly if you run first thing in the morning? (Unfortunately, PowerBar or Cliff Bars are not an option for me because of gluten, but Larabars could be. Just haven't tried it yet.)