A few years ago, authors Peter Menzel and Faith D’Aluisio published “Hungry Planet,” a fascinating book with pictures of what families eat around the world. The picture from Mexico was revealing. If you take a brief look, it seems a quite healthy diet, varied and containing lots of fruits and vegetables. But if you look more closely, you will notice a dozen 2-liter bottles of soft drinks and about two dozen beer bottles at the back of the picture. In addition, in front of two children, there’s a table with sweet breads and other high-calorie snacks.