The 12^th National Congress on Nutrition & Dietetics took place from December 5 to December 8, 2013. On December 7, a Round Table was held in the context of the Congress, entitled: "HYDRIA: National Study on Health and Nutrition of the Greek population". Dr A. Trichopoulou was the coordinator and Dr F. Orfanos, Dr E. Valanou, Dr A. Naska, Dr. E. Klinaki and Ms E. Tsigarida presented the following topics : "Sample selection" , "Methodology of data collection", "Nutritional data", "Laboratory analyses", "EU MENU - Pan-European survey of food consumption".