In her two previous books, French author Mireille Guiliano instructs women on how to live their lives to the fullest by, ironically enough, not eating to the fullest. She insists that the French have the right answers, pointing to the French joie de vivre as one of the reasons why the country's women stay so infuriatingly thin. (The title of her first book says it all: French Women Don't Get Fat.) In her latest book, Women, Work & the Art of Savoir Faire: Business Sense & Sensibility, released in the U.S. last week, Guiliano tackles the business world, using her distinctive French philosophy and her 20 years of experience as a spokesperson for Veuve Cliquot to give women advice on striking the right balance between their personal and professional lives. TIME spoke with Guiliano about the book and why she believes women are smarter than men.