The author does not cite any references for these opinions...at least, I didn't see any. She does have a link at the bottom of the page to ads for recruits for clinical trials that test these hypotheses.

It's so annoying when writers make bald statements like these, without anything to back them up. And it's lazy. Well, I guess I'm a little lazy, too. I'm not going to search all over the Net trying to prove or disprove what she's saying unless I'm writing an article of my own!

Thank you, Mathmaniac, for posting the link to an article about how exercise alone does not necessarily lead to weight loss.