This is a great video on a 12-month randomized study that was done at Stanford University by Christopher Gardner, PhD, Abby King, PhD and colleagues on some of the popular diet books that out there. If you have tried (or are thinking about trying) either the Atkins, Zone or Dean Ornish Diet at some point I would highly recommend watching the video and reading the white paper seen in JAMA. The amount of weight loss during the study was a modest 2% to 5% from baseline. Those subjects who followed the Atkins diet did have more weight loss than the other three groups. For the complete results published in the JAMA paper click here.
The A to Z Weight Loss Study: A Randomized Study. JAMA, 297(9): 969-977, 2007.