You poop out on your run? That tells us right there that something is wrong. I don't even remember which fad Atkins is, but the whole carb phobia that's so fashionable right now is exactly the kind of thing that will backlash and put all the weight back on. To keep it off you need to exercise and eat enough. Starvation will make you fat.
Covert makes the very wise observation that fat people have lots of diet books. That's because they don't really work. It's great that you ditched the forty #s with what is essentially a metabolic gimmick, but it doesn't really last. I bet you're worked up into a fat and carb phobia? You can't burn what you eat without fat to enable the process. And not enough carb is what poops you out- that's the fuel for your muscles. You want good quality long chain carb, whith the occasional Ho Ho thrown in. And as you gain muscle the # on the scale will rise, but go by how your clothes fit. A lot of elite athletes are 150 pound size eights. I kid you not.
Get the book, it'll tell you amazing stuff. Actually he's written a lot of easy to read books that will be at the library, and there are tapes of a series for PBS that are the easiest way to go if you can find them. Go to <www.covertbailey.com> for the instant quick and easy version.

High mileage is relative, and usually considered in miles per week.100 is a nice figure, The point where you can eat what you want- you'll want what you need. But as a newbie you won't do that. You should think in time spent in your traing heart rate zone at first. And you need to learn how to handle the bike and spin.

Lizzy