Wow, I can't believe that someone missed the point so completely!
The point being that it is unlikely that the brain is stealing the glucose and thus stunting growth like the article supports, because when kids are fat, that means they have metabolized carbs->glucose->fat, and thus have had plenty of glucose. That fat kids' bones don't appear to shoot past normal kids in growth strongly suggest that there are other reasons why kids don't grow physically to adults in half the time.
I suggest that being smaller and having different proportions to adults triggers the "do not harm" and "protect" instinct in most adults, thus increasing the chance of reaching adulthood and bringing one's genes on.
There are probably other survival advantages, like having less mass and more flexible bones might be adventageous at the age one learns to climb trees and cliffs.
When reaching the age where one is going to procreate and bring up own children, the advantage is to have a more adult body, capable of hunting, foraging, carrying and protecting.
Get it now, or are you going to get sidetracked by a single word again?