Yeah, I was gonna say that, too. Plus, I feel like grade school kids are still learning what their body kind of is anyways, so they're not exactly a reliable source.  I was a skinny kid and I still thought I could have lost weight - not for any real reason, either. No, wait, it could have been because I thought that if I was light enough, I could use my rain coat as a glider and fly around if it was windy out.  At 3rd grade, I think kids have other things on their mind than weight, or that most of those 42% have skewed and not permanent ideas of what weight they should be. They're still learning what's "good" or "bad" in terms of body and health.  But yeah. It's probably that a good portion of them are actually overweight and do need to lose it.