Aaah, sports drinks...
My rule-of-the-thumb for them goes something like: If it tastes revolting, you don't need it and should stop there. If you take a sip and proceed to gulp-down an entire bottle in one hit, then you made the right choice.
*shrug* that's just me, though...funny how that mechanism is so pronounced. :)
What I can't understand is how people will drink the stuff when they're not (or haven't been) exercising. Doesn't their body tell them to back-off? Are they so deluded that they're thinking: "Fit people drink this stuff, so the more I drink, the fitter it'll make me"? [Yes, I've heard this argument and it's so wrong that it's scary to hear people say it.]
Same story with salt in food. There are very few occasions where I'll add salt to food while cooking, and usually that's when I want it to taste salty. then-again, there are times when I'll get a craving and gobble a pack of chips/crisps (yuuum, Kettle Chips).
</rant>

Anyway, ta for yet another highly informative and excellently expressed article, Thorf. :)