"I have to believe the number of adolescents who would damage their bodies because of poor weight loss tactics would have to be less than 1%!"

I too think the number is quite small. I think it is greater than 1% but definitely NOT a large percentage. Probably would have to come to agreement as to what does and does not constitute "poor weight loss tactics;" which would be an interesting discussion!

Rules are necessary so as to allow for consistency. Also, rules are often the result of those few who seek a competitive advantage by not following the rules already in place.