People wanting to get a start on the New Year’s health resolutions might take a peek at these three titles. “Vegetarianism Explained “by Natasha Campbell-McBride explains how foods are digested and used by the human body and suggests how to build an optimal diet with that information. “The Big Fat Surprise” by Nina Teicholz argues the case for keeping fats in your diet.     “The RBG Workout” by Bryant Johnson poses a simple question: can you keep pace with octogenarian court justice Ginsberg’s workout schedule?  “Slow Medicine” by Victoria Sweet argues that good medicine takes time: time to listen to bodies, weigh options and arrive at the right treatment.