I doubt that there would be a reaction between the caffeine and glycerol. The mechanisms of each are different.

Although the mechanisms of glycerol hypohydration are not completely understood it is most likely an osmotic effect i.e. glycerol pulls water with it and “holds” water in your body. As metabolism occurs it is thought that the water is available to help maintain hydration status.

Caffeine, as a diuretic, works on the kidney system (specifically the renin angiotensin system). With that said caffeine is not a diuretic during exercise. Prior to and after exercise it is, but not during. Of course there are always exceptions and something like an ultra may occur at an intensity that allows for some diuretic effect.

Does glycerol make you feel bloated? I also wonder how it’ll react with something like say, Coffee, which is actually a diuretic. Its always the cross reaction side effects that scare me, even though a supplement by itself won’t really show any adverse reactions to the body.

thanks again for responses

“I generally recommend .5-1L h2o with at least 240 Calories of carbs.”

do you mean per hour?

regards

For all long stuff consuming adequate fuel during the ride (especially after 2-2.5 hours) is important. I generally recommend .5-1L h2o with at least 240 Calories of carbs.

Donald/Chris

How about eating advice on LONG touring rides. Like six / seven hours of hard going?

Thx for articles