Why Doesn’t Exercise Lead to Weight Loss?

From the article:

Finally and thankfully, exercise seems to aid, physiologically, in the battle to keep off body fat once it has been, through resolute calorie reduction, chiseled away... The exercise seemed to reset certain metabolic pathways within the rats, Melanson says, that blunted their body’s drive to replace the lost fat.

http://well.blogs.nytimes.com/2009/11/04/phys-ed-why-doesnt-exercise-lead-to-weight-loss/