Anyone have any idea what could cause this? On long rides (100 miles), I've been practicing nutrition with both Infinit and EFS. My tongue turns white, my mouth gets to where it doesn't want any flavor drink, it seems to be worse in humidity.

I'm wondering if it's a deficiency of something. Or dehydration? So far, its done this for years and I can't figure out how to fix it. Anyone else ever experience this or have an idea what it might be?