Retraction to: International Journal of Obesity https://doi.org/10.1038/ijo.2013.20, published online 05 March 2013

The Editor-in-Chief has retracted this article because the authors could not confirm approval from an appropriate ethics committee to recruit healthy donors to provide samples for use in this research.

M. Million, E. Angelakis, R. Giorgi, R. Valero, and D. Raoult did not respond to correspondence from the publisher about this retraction. The publisher has not been able to obtain a current email address for M. Maraninchi, M. Henry, or B. Vialettes.