Go for the Luna Protein bar. It delivers 12 grams of appetite-satisfying protein and 3 grams of fiber in a decidedly candy-bar-like package. Don’t be fooled by the chocolate and the nougat, though. This snack won’t let your blood sugar down — and like all Luna Protein bars, they’re gluten-free. About $1.75 at your local natural grocery, or from www.lunabar.com.