Ditto, Steve.
My Two Cents: as a runner (and an eater!) I find certain patterns that are true for
me.
When I weight train very heavily, I find myself very hungry and eating more than I planned (a lot of the time to surplus calories).
When I'm not exercising, I tend to eat out of boredom, often to surplus as well. Dunno why, and it sucks.
But when I run a LOT, I notice my appetite somewhat decreases and it is easier for me to have 500 calories+ deficits. This is NOT always true. But I have noticed these patterns. Running all the time can cause muscle loss, if you're not throwing in some resistance/weight training. Muscle is pretty important! Still, I can run for over an hour, burning up to 800 calories if I'm really pushing myself on a hilly trail. This allows for some eating! But if you're a big eater, you probably won't lose much weight. You have to come up with some kind of plan to fit your caloric needs and exercise routine.
Also, the myth that runners can or need simple carbs is bullshit. My runners book advocates a whole-grain, whole food diet, although be warned: don't over consume fibrous foods before a long run in the wilderness or you might find yourself behind a tree with a couple of fern leaves!!!

I think people should
always try to consume high glycemic index foods with low glycemic index foods at the very least--you don't want to make yourself insulin resistant, even though running is good for those regulations. At least, I personally experience sugar crashes that make me feel terrible when I eat large amounts of cookies, cake, etc...
Some people experience appetite reduction with cardio activities. I personally do with running, but you
can't eat just junk. If you run everyday, AND focus on a whole-foods diet with occasional junky treats, and watch your intake, I don't see why you wouldn't lose weight fairly quickly. AT this moment I am trying that myself (not running EVERYDAY but more than I have been).
Good luck, hope that helps, and if I'm mistaken about something I'm sure someone will pop in and correct me
