Given the epidemic of obesity in the population, it's important to know where best to intervene.
We know that children who are overweight have advanced bone development -- they grow faster in all ways, and they are usually taller than their non-overweight peers. That same sort of growth promotion could be linked to the early onset of the maturational change.
For the parents of a girl who is not overweight and who gets her first period early, it doesn't mean she's at increased risk for being overweight as an adult. These findings are significant because they show us where our efforts should focus: childhood obesity.