A new diet book is climbing to the top of the New York Times best-seller list.
"The Fast Diet," also known as the "5-2" diet, allows 'normal' eating for five days out of the week, then fasting for two non-consecutive days a week.
The author of the book is UK medical journalist Dr. Michael Mosley, who discovered the diet while working on a TV science show as a human guinea pig.
The health, diet and exercise-focused science series comes to PBS's "Exploration Wednesdays," premiering April 3rd at 10pm Eastern.
See more from Soledad O'Brien's interview with Dr. Michael Mosley, where he explains the method and science behind "The Fast Diet" in the video above.