Good on you! Similar story here - 6 years ago I lost 100 pounds through better diet and running. Started with Couch to 5k also. Since then, I've run 15+ marathons, and even a few ultras. I'm the healthiest I've ever been, and have never felt better. Plus, I'm setting a much better example for my kids than I was previously. Now they're really starting to get into running too, and have been doing some of the shorter kids races.