Constipation

[OakLeaf]

But I still have to deal with one thing . . . how can one handle constipation during a bike ride?

Do you have a larger pair of shorts you can wear when that's an issue so there's not so much pressure on your lower belly? Hydrate extra to help flush out the toxins?

Sorry, I've never dealt with it on a ride (it's been a while since I dealt with it at all, thank goodness), but those are strategies I've used.

[Sky King]

You don't mention if you are drinking an electrolyte replacement, some brands really give me fits - I can't drink most of them. One I can tolerate is Ultima,which is sugar free, caffeine free and Vegan. I can also handle Nuun (most of the time) So if you are drinking some sort of electrolyte replacement try switching.
I second the slimming teas, I often carry those both for biking and backpacking because nothing is worse than being uncomfortable