The European Association for the Study of Obesity (EASO) and the Turkish Association for the Study of Obesity (TASO) are pleased to invite you to the 18th European Congress on Obesity (ECO). The ECO2011 scientific programme has been developed by a committee of leading European experts. It features invited presentations in the form of Plenary Lectures, Review Sessions and Workshops. There will again be numerous presentation opportunities in the form of abstract selected Oral and Poster Sessions. For poster presenters, there will be a Chaired Poster Sessions and a 'Poster Networking Reception'. The deadline for receipt of abstracts is 7th November 2010. For the first time at an ECO, EASO has invited sister associations to develop specific sessions within the official programme and in 2011, delegates will be able to attend topic related sessions organised by EASD (obesity and diabetes), ECCO (obesity and cancer), ESH (obesity and hypertension), IFSO-EC (obesity and bariatric surgery) and ISBNPA (obesity and nutrition/physical activity).