Hormones and Metabolism Conspire Against Dieters
"There are some fresh insights from Australia that help explain why it's so difficult for dieters to keep off the 
weight they lose."
"Willpower will only take you so far, in case you haven't run that experiment yourself. Turns out our bodies have a fuel gauge, not entirely unlike the gas gauge on our cars, that tell us when it's time to tank up on food."
"The gauge relies on hormones that signal to the brain when and how much to eat. But as Dr. Louis Aronne, who directs the comprehensive weight control program at Weill Cornell Medical College in New York, explains, the human fuel gauge can sometimes be way off the mark — especially for dieters."