This report describes the results of the first and second collection of data in the joint Nordic Monitoring System of diet, physical activity and overweight. It is well recognized that health in the European Region needs to be improved and Nordic public health researchers have since 2008 developed and validated a Nordic method to assess diet and physical activity among adults and children. Data has collected on health behaviour and overweight in 2011 and 2014 among 18,000 adults and 5,000 children. During the three year survey period, significant changes have occurred in the Nordic countries, especially among adults. The Nordic Monitoring System shows that lifestyle and weight status differ between the Nordic countries despite highly comparable societal structures. Favorable and unfavorable health behaviour is present in all countries and there are areas to be improved in all countries.