Ok, so there's nothing inherently wrong with eating breakfast. That being said, I'm not sure anyone can say that people who eat breakfast are "they type of person who is more likely to exercise and eat healthier meals" -- WebMD makes no effort to substantiate their claim at all with any references. That, and the fact that, at least here in the good ol' US of A, there is an enormous problem with obesity, diabetes, and a host of other metabolic-related illnesses. I bet if anyone counted, they'd find that an extremely vast majority of those people eat breakfast everyday. Anecdotally speaking, almost all of the people I know who skip breakfast are absolute physical specimens when it comes overall health and physique (That doesn't mean there aren't those who fit that criteria who DO eat breakfast, just a personal observation)

There has been a lot of research around periods of fasting, and Martin Berkhan has done a lot of work parsing out nonesense (poorly designed studies, etc.) on this particular topic. This specific article might be something you should check out regarding the cortisol awakening response, and why people who eat breakfast generally tend to weigh more than their intermittent fasting counterparts: http://www.leangains.com/2012/06/why-does-breakfast-make-me-...