“ The Secret Lives of Mormon Wives ” executive producer Jeff Jenkins knows his morning news diet isn’t healthy, but it’s a function of the life that he’s chosen. “My alarm goes off, I pull out my laptop and the first thing I do is go to TMZ,” he says. That’s how he learns what his cast members were up to overnight — and how his day might go. “It gives me a little head’s up before I get to the office,” says Jenkins, who notes that it’s not a new practice. A few years ago, as EP of “Keeping Up