Image Credit: Illustration by Riccardo Panelli. The picture of the Venus of Willendorf is used in agreement with Creative Commons CC-BY 2.5 licence, from http://en.wikipedia.org/wiki/File:Venus_von_Willendorf_01.jpg. Background image, lipidomic profile from Medina-Gomez et al. PLoS Genet. 2007;3:e64.