"Fast food requires fast decisions, and we wanted to create a guide to help people lose weight while still eating fast food," the New York Post quoted David Zinczenko, author of the book series 'Eat This! Not That!'' as saying.

Topping the list as the worst of the worst was the Tuna Melt sandwich combo from Quiznos.

The value meal tops out at an astonishing 1,900 calories -- the equivalent of eating an entire bag of Chips Ahoy! cookies and near the average person's daily caloric intake, the study noted.