Dr Howard Eisenson is the Programme Director of the Duke Diet and Fitness Center in America. A graduate of Duke University Medical School, Dr Eisenson lectures extensively on the subjects of obesity, physical activity and promoting healthy behaviour change.Martin Binks, PhD, is the Director of Behavioural Health and Research Director at the Duke Diet and Fitness Center. A psychologist who specialises in obesity treatment, research and education, Dr Binks's interests include weight-loss maintenance and obesity treatment development.Visit the Duke website at: www.dukediet.com