French Women Don't Get Fat by Mireille Guiliano

Second Hand 

The book we've all (certainly every woman between 25 and 75) been waiting for. Classy, chic, convincing, funny, wise, well-written and very timely. It's the ultimate non-diet book, which nonetheless shows us how to eat with balance, control and above all pleasure. Chuck out all the radical diet books, think about what you eat and why, and then enjoy eating the right things (and some of the wrong ones) intelligently, and in smaller portions. Eat, like a French woman, with your head not your stomach.

Guiliano, French-born and bred, gets the tone absolutely right. She succeeds in that rare high-wire act of being really serious about her subject but without taking herself too seriously; manages to encourage and inspire and amuse, without being bossy or earnest.