The study will be conducted as a continuation and development of "6-10-14 for Health" program. The first phase of the program, financed by the municipality of Gdansk, was conducted in 2011-2013. The program comprised of screening and survey conducted among all 6-, 10- and 14-year-old children attending primary and grammar schools. A total of 18 162 children (including 7 448 6-year olds, 6 720 10-year olds and 3 994 14-year olds) were examined. A group of children with risk factors of civilization-related diseases (overweight and obesity defined according to BMI percentile charts. was identified on the basis of the screening. This group included 2 798 (16.32%) children, among them 9.17% of 6-years of age, 19.30% of 10-years and 20.48% of 14-years). All these children were qualified to intervention and education program. A total of 1 627 children qualified on the basis of screening eventually took part in the first edition of the program.