The aim of the present study is to assess the incidence of underloverweight and obesity in a sample of children 6-Il years old in Turin province and to monitor the secular trend in weight. Our survey shows that about 2% of children are underweight, 17% overweight and 3% obese. Males show a prevalence of overweight and obesity, while females show also underweight problems. The comparison of current data with those collected in 1979 by Ente Italiano Moda (E.I.M.) [I] shows a significant increase of weight problems in both sexes: this, in childhood, is an emergent social problem that can produce adverse health effects in adulthood. It could be prevented encouraging correct eating behaviors and active lifestyle among children.