Originally Posted by pdlamb

Are you sure your blood sugar was running low, and not that you were behind on fluids? Three or four hours (I'm guessing, obviously) is longer than I can ride in the summer with just the fluids I carry on the bike. You might need to drink more, or add some salt. If there's a convenient store with V-8, that fills the bill, though you'll also want more water to wash it down.