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Introduction: Irregular eating patterns such as excessive portions that are not controlled and become a habit in children that cause BB stastus in children will become more or obesity. The purpose of this study was to determine the relationship of diet with the occurrence of obesity of school age children in SDN Kutorejo 1 District Kertosono Nganjuk.

Methods: This research uses associative design research (case control). This research was conducted on May 03, 2018 at SDN Kutorejo 1 District Kertosono Nganjuk. The population was all children in SDN Kutorejo 1 District Kertosono Nganjuk. A sample of 209 respondents were in accordance with inclusion criteria and exclusion criteria. The sampling technique was proportional stratified random sampling. Independent variables are diet and dependent variable of obesity of school age children. data collection using questionnaires. Statistical test using Coefficient Contingency with significance α = 0,05.

Results: The research results obtained almost half of the 75 respondents (35.9%) have a good diet and most of 152 respondents (72.7%) are not obese. There were a relationship between diet and obesity where obtained ρ value = 0,000 because ρ value ≤ α (α = 0,05) then Ha accepted and Ho rejected.

Conclusion: Poor eating patterns are very influential on the occurrence of obesity, where if school-age children get a diet that is not balanced or consume excess calories than consuming calories in a balanced manner will be at risk of obesity in school-age children

Keywords: Diet, Obesity, School-Age Children.