Forestryworks, who's name I don't know, sorry, is dead on in my book. Avoid sugars, reduce carbs without fiber and buffer it with protein. You rarely have trouble getting enough carbs in America.
I'm a big believer in the Zone type of diet, where insulin release is minimized.
Juices without the fiber of the fruit will absorb quickly, and you'll have to drop insulin into your bloodstream.
Juices might be the first stage antidote for a sugar crash, but FW advice is to prevent the need for an antidote. IMO, second stage antidote is going to be a balanced meal with nearly equal CALORIES from carbs, protein, good fats.
PS, I used to get sugar crashes. Coffee in the morning without food, suppressing your appetite to start the day might make you feel good to go for a while, but its almost always best to have some water, a balanced meal soon after getting out of bed, and coffee is okay. (Coffee is a weakness of mine at times.)