For today’s edition of Dear Mark, I’m answering four questions. First up, I discuss what to do—and really, what not to do—as you approach your goal weight but keep coming up short. Second, why do breakfast skippers also tend to be the biggest coffee drinkers around? Is it just correlation or is there a causative explanation lurking within? And finally, what’s the deal with the cultured dairy product known as quark? Is it a worthwhile addition? Is it safe, given its decidedly neolithic origins?