Like "Try this as a starting point http://www.dietsite.com/dt/Diets/Diabetes/DiabeticSnacksBeforeExercise.asp I have horrible trouble with exercise and blood sugar. Anything that includes shorter bursts of high intensity, like soccer where you are constantly changing from walking to jogging to sprinting, sends my blood sugar up. Things that include longer, less variable activities, like swimming, lower my blood sugar. Working out what to eat and when is hard to figure. There is a book called The Diabetic Athlete that might also help."