Nah, the salt in grape nuts flakes is pretty low. Like I said, I drink two gallons of water a day usually, so I'm not too concerned about sodium. Other than a few things of junk during the weekend, there's really not a lot of other processed foods in my diet.

As for water weight loss in the first few weeks of the atkins:

http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22atkins+diet%22+%22water+weight%22+&btnG=Google+Search

It's hard to find a good explanation of why this happens (It's been years since I've read any good nutrition exercise sites or articles so I'm not the best one to ask...I'll try to contact Lyle Mcdonald on this), but as you can see, it is common. It's almost like increased water retention when people first start taking creatine: Most gain around 10 lbs. in the first few weeks but it's water weight that goes away when you stop taking it.

The 10 lbs. people lose is most likely depleted from muscle stores from what I can remember. It's not the "radiation system" water that you piss out all day.