Originally Posted by
kensuf
possibly dehydration. drink more. add some endurolytes to your bottles too, the heat has been killer the last three months and you could be just suffering the effects. I use the hammer enduralytes, I break open one cap per bottle and mix it in.
edited to add: saw your follow-up, how long was your ride? even though it's been "cooler" in the mornings, the humidity has been so fecking high (at least here a whopping 70 miles west of you) that I'm going through ~2 bottles in 90 minutes right now.
I only rode 28 miles, at a steady pace. I was out for about 1:45 total, with stops and all. I don't add as much G2 powder as the tub suggests, but maybe I'll start mixing it with a higher concentration.