Obesity percentages for Lake County, Illinois. Explanation of field attributes: Pct_Obese - The percent of people in the zip code who are considered obese, defined as having a BMI greater than or equal to 30. ObsOrOvrwt -The percent of people in the zip code who are considered overweight (defined as having a BMI greater than or equal to 25 but less than 30) or obese (defined as having a BMI greater than or equal to 30).