It will lead to either dehydration or overhydration just as easily as euhydration.
The only good way is being properly scientific and measuring your sweat, and rehydrating at that level.
Which is actually what Noakes says: http://www.ingentaconnect.com/content/adis/smd/2007/00000037/F0020004/art00050
"This article argues that humans are designed to drink just enough to maintain plasma osmolality, not necessarily bodyweight, both at rest and during exercise."
Otherwise you might as well just guess.
Yeah, because following your thirst doesn't work.
It will lead to either dehydration or overhydration just as easily as euhydration.
The only good way is being properly scientific and measuring your sweat, and rehydrating at that level.
Which is actually what Noakes says: http://www.ingentaconnect.com/content/adis/smd/2007/00000037/F0020004/art00050
"This article argues that humans are designed to drink just enough to maintain plasma osmolality, not necessarily bodyweight, both at rest and during exercise."
Otherwise you might as well just guess.