Let's also not discount the possibility of a DRD-2A1 Allele defect causing a dopaminergic pathway problem in overeaters - Dopamine is crucial in satisfaction/full-feeling, and some people need dramatically more dopamine before they feel sated compared to another person.
Additionally, @ mr. runner up there, as someone who had to lose 55 pounds to get into the Army, I can say with certainty that running when you're overweight can cause far more problems than it solves. Damage/wear and tear on all of your supporting joints, back pain, etc is all extremely common. Overweight folks have to resort often to other measures such as ellipticals or rowing, which are expensive to own (As is going to a gym, $70/mo here in Davis). Biking is great, but it takes a lot longer to shed weight Kcal for Kcal on a bike vs. running, you know that.
And running for 30 minutes is misleading.
You stretch for 5-10 minutes before.
You warm-up for 5-10 minutes.
You jog/run for 30-35 minutes
You cooldown for 5 minutes
You stretch for 5-10 minutes after
You're sweaty so (hopefully) you shower, there's at least 5 minutes, maybe 10, or 15 for some people.
Now tell me how that is "just" 30 minutes.
Look, I'm not saying that exercise is bad, obviously. But you can't take a one size fits all approach to it, not at all. And it's great how you avoided Cheb's post, OCizzle, about how you'd respond to a patient with chronic pain, or even better, fibromyalgia (Not even an empirically proveable condition). It sounds like you've got a bad case of "holier than thou" and because 30 minutes a day of jogging/running keeps you thin, you think it works that way for everyone else.
How abouit someone with a BMR that's really low, or someone who suffers from undx'd bradycardia? Even after they exercise their BMR may return to baseline (slow) and the beneficial metabolic effects you experience throughout the day / night are gone for them. Not to mention some people eat the wrong stuff in general - Not everyone processes/catabolizes lipids the same as another, etc. I suggest reading "Eating for your Type", it's very interesting and even if you disregard it as quackery, it can be enlightening to hear other peoples' stories.
Especially good for you, OC, since you seem to think you've got it all figured out and anyone who is overweight is that way by choice.