I went from 175 last Christmas to 164.5 by late September. Then blew out my back and gained five pounds in five weeks. I'm running again, but that five pounds have become seven, and I feel fat.
So I'm reading this thread with interest.
My three principles for runners who want to lose weight:
1) Don't drink. I really like my big fat Martini every night. It's 400-500 calories. The problem isn't just the calories from the drink, but the calories from what I eat when the drink creates disinhibition. Cheese and crackers, etc. So if I'm serious about weight loss, the first thing I do is put the Tanqueray in a high cabinet and seal it--or just empty the bottle into the sink. (Corollary: once I'm up to 45 mpw, I can drink the Martini and still slowly drop weight.)
2) Drink lots of water. This helps in so many ways. One key way is that it prevents you from eating when you're eating only to replenish fluid loss. This is more critical in the summer, but you can still end up running a water deficit when it's cold and dry--and that will lead your daily weigh-in to give you an illusory sense of weight loss, or holding the line.
3) Weight yourself every morning, without fail. This is absolutely key. You can't lose weight if you don't account for what is actually there, and actually happening. Those of us who weigh ourselves every morning, first thing, learni all sort of interesting things about...well, you know. How much stuff weighs. How much the morning cup of coffee weighs. How much what it explosively pushes out weighs. We learn.
4) Eat lots of salads. I do. Make your own dressing. Buy bags of those milled "baby" carrots. Keep it moving.
5) Don't eat junk food. My only saving grace is that I just don't eat junk. I don't buy it, I don't eat it. I just eat too much of the good stuff.