When I read the OP, I thought, well, this certainly seems odd. Then just now, I looked up G-Zero, which refers to the new world order, in which western governments decline to take any international responsibilities, and developing nations are all looking inward. Other than that, it turns out to be the name of a Perpsico beverage with no nutrition at all, so inexpensive to make. Electrolytes are not nutrition, "the process by which a living organism assimilates food and uses it for growth and for replacement of tissues." Totally appropriate. Way to go, Pepsico!

Yeah, so it's just blood sugar drop out. To avoid it, try eating 200 calories/hour while on the bike. Fix you right up, you betcha.

I suppose I should mention that sugar is super good for you while you're riding. Maltodextrin is even better. You don't need protein for such short rides, but it's good to have some later in the day. Eating during the ride will also reduce post-ride hunger.