Really Salty Energy Drinks?

[BleeckerSt_Girl]

I can't help but wonder if you aren't overhydrating. That will also dilute your blood to the point where your electrolyte levels can drop too low. 2 x 20 oz is a LOT to drink on a 20 mile ride when its only in the 70s. I would barely drink that much on a 40 mile ride if it were that cool out.
My husband gets cramps from low electrolytes. He drinks a V8 at the rest stop. We both also tried pickle juice once that was served on a group ride rest stop. Tasted better than it sounds and also high in electrolytes.

I was just thinking this as well, and speaking for myself, I can't imagine drinking 40 oz of fluid for a mere 20 mile ride at 70F degrees either. I rode 20 miles this morning at 50F and didn't feel like drinking at all, but I made myself drink about 8 oz midway through anyway (eat before you're hungry, drink before you're thirsty and all). I started my ride after drinking a glass of water anyway. At 70F I probably usually drink about 16oz over a 20 mile ride and feel comfortable. I drink a lot more when it's hotter of course.

Unless you are sweating huge amounts during that 20 miles, you might think about cutting down on the sheer volume of your fluids, while adding some electrolytes to your water and continuing to have nutritious snacks in your stomach.
Drinking way too much water within a certain period of time can actually cause severe headaches.

One other thing worth mentioning, simply because it seems odd to me that a young person would consistently get headaches after riding 20 miles. (and by the way...do you get headaches frequently when not riding?)
This happened to me- I was wearing some Polarized sunglasses that i 'thought' were high quality, but as it turns out they were giving me terrible headaches. I only wore them while riding my bike, and I would get a nasty headache every time after about 30 minutes of riding. When it dawned on me, I experimented with removing the glasses and sure enough my headache would totally disappear after 10 minutes of riding. I put them back on and the headache would quickly return. I dumped them and got better sunglasses and the headaches disappeared. Maybe not what's going on for you, but I thought I'd mention it just in case.