“You find me the person who can blame obesity or diabetes on an excess of carrots or apples, and I will give up my day job and become a hula dancer!” That’s Dr. David Katz, director of Yale’s Prevention Research Center, responding to the growing attacks on everything that contains sugar. Sugar is the new fat. We’re being spoon-fed a daily dose of warnings, many of them coming from UCSF’s Robert Lustig, who refers to sugar as “the Darth Vader of this sordid tale, beckoning you to the dark side.” (In the end, he admits he’s your father and takes you out for ice cream.) How bad is sugar? And how good are its replacements. James Hamblin sweetens the pot with his piece: Being Happy with Sugar.