Not hypoglycemic but I can bonk with the best of 'em. I try to keep the simple sugars to a bare minimum and have a good mix of complex carbs and some protein for breakfast and some energy bars/hammergel on the ride. I carry a bottle with water and another with energy drink (really one of those concentrated Orac Super 7 type of Acai/berry + water drinks) that I drink starting about 20 minutes in (just a mouthfull at first). Some gel about 1/2 hr in. If the ride is for more than about 1 1/2 hrs, I will eat a banana and some gel or some Luna Moons, and more gel after another 1/2 hr. If it hits the 3 hour mark, I then will have an energy bar. Hydrate throughout- very important.

On long MTB rides, I can take a bit more on the ride, like a peanutbutter sandwitch, as I have more room with a Camelbak, and a few energy bars and some veggie chips.

For me the main thing is to be proactive. By the time I am feeling a bonk-headache it is too late so I try to get some carb in every 1/2 hr or so.