Here in Ann Arbor, it's been freakishly warm: 60s and sunny. This has triggered some early spring fever: I've been writing on the porch, driving with the windows down—and craving rosé before dinner and ice cream after. Last Friday, I stopped by Whole Foods to pick up a pint of Talenti Sea Salt Caramel Gelato, but was sidelined by a display of Halo Top, a low-cal, low-sugar, low-carb, high-protein ice cream brand I’d been reading about on nutrition blogs.