When you're a water nymph and 99.99% of your body is composed of water (as opposed to the boring and rather dry 70%~) overindulgence can be a bit more of a sin than it is for other beings. Sure water tastes good, it feels good on your skin and in your mouth but too much of it and you can bust up your spill reflex, leaving you a great, big, retaining waterballoon.

Mmm it might feel good the first hour... maybe the first day, but sooner or later you're going to have to face the ridicule of the rest of your people and kids using your tummy as a trampoline gets old quickly!