When I lived and cycled in Ontario, which gets 90% humidity and more... quite often in summer, I would finish off 2/3 of 21 oz. bottle of water in 3-4 hrs. I seriously cannot seem to ingest a whole lot of water before, during a ride, without prompting powerful need to empty my bladder every hr. ...which is not a sensation I want for a ride of several hrs. at a spritely pace.
However during the same 3-4 hr. time period, I do need to drink and also stop, eat something small at least...fruit, or at least 1/2 sandwich or gelato/frozen yogurt, muffin, etc.
Now living in Vancouver where our humidity..just feels perfect (and less draining than Central-Southeastern Canada), I seem to have less need to drink alot of water/liquid but probably due to age, not our mild climate, I seem to need to eat more energy food before a ride, etc.
However definitely cycling in the interior British Columbia, where it is much drier, I do need more liquid.
I did experience bonk in 99% humidity when we were cycle-touring. It was only a 45 km. ride and I didn't have any breakfast except for a fruit and water. Thought I would be ok and so with my panniers loaded, we cycled off. By the edge of town on a major 100 kms./hr. highway, I was weaving...ready to faint.
Fortunately the impending lightning-thunderstorm truly kept me going.....for shelter without collapsing.
I was very surprised by my (weak) reaction...already I had done 350 kms. in a few days on the trip, in prior to that near-fainting-blackout..





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