well, I am wondering how many of these people posting have more than anecdotal evidence. I have a degree in the sciences and have taken many courses in human physiology and Flagpole's equation might not be accurate, but they are not far from the truth.
As many people have pointed out, the equations aren't perfect b/c people have varied internal chemistries. That being said, you can predict on average (ie using some sort of distribution, most likely normal/bell-shaped) to predict what most people will fall under.
Wow: if you drop your mileage significantly or don't run competitively after college your eating habits will surely lead to weight gain. I am a male at 6' 170, run 50 miles a week, and eat about as much as you, probably a bit under.
girl runner: " I DONT believe Caitlin eats 7000 calories a day unless she's got a freakish metabolism, which is hard to believe as well because your metabolism slows down when you're in "starvation mode", and it's hard to get it back up" This is right. When you starve your body, metabolically your cells get an internal signal to start storing energy rather than using it. When you are anorexic it is not uncommon to start breaking down muscle, which are proteins. This is the most inefficient way to get energy. When your body experiences this it is a shock to the system and one of the first responses is not to build back muscle mass, but to store excess energy as fat, which is much easier to break down.
flagpole = know-nothing freak: You are 6'3" and 160. You are already an outlier relative to the majority of the population. I have a friend who is 6'0" and 135 or so. He is the same way. He eats all he wants and even in times of injury does not seem to gain weight. This is not what most people are like.
If you talked to the majority of phsiologists, gave them CC's specs, eating habits, and current training regime probably every single one tells you that if she is doing this she is on course for a train wreck.