[High levels of overweight and obesity in four year olds in Sweden].

Childhood obesity is an increasing global health problem. Prevention and early treatment is crucial. The Swedish child health care targets almost all children and iso-BMI is assessed from the age of two. National reports on the prevalence of obesity are scarce. In this report data from the Swedish child health care on 105 445 four year olds was collected. Overweight (9 %) and obesity (2 %) was registered in 11 % of the children, which is in line with earlier, smaller, reports. More girls than boys were overweight or obese.  To improve the situation, the problem needs to be addressed by the entire society. Further evidence-based methods on prevention and early treatment need to be established. The Swedish child health care registry will enable follow-up on prevalence data.