Considering her mother screamed and even cried when her daughter overate, it's no wonder Valerie Frankel struggled for decades with various body-image issues. But to her credit, Thin Is the New Happy is neither an indictment of her mother nor a gushfest on learning to love one's belly bulge. Rather, it's a gritty, funny tale about one woman's quest to jettison a lifetime's worth of hang-ups, not to mention a closet full of Old Navy duds. A-

