Researchers in Australia tried to identify at when parents would get concerned about their children’s weight according to the child’s BMI. They found no “definable BMI threshold.” The authors speculate that this may be why current childhood obesity policies are ineffective as they typically require individual concern leading to family behavioral changes. At what BMI are parents of pre-schoolers concerned… [Int J Pediatr Obes. 2011] – PubMed result. This finding corresponds to a survey we did at the American Obesity Association (unpublished) which found that parent s were only concerned about their children’s weight after the child first expressed concern about it.