Really highlights the point that either extreme of weight is unhealthy, but being extremely underweight will kill you faster.
The importance of accepting kids' size
There's a lot I could write but I'd just be re-stating what's in the article which has a lot of important information. Fat is a symptom not a cause of bad health. The "war on fat" has made people fatter.
I read a book that said very similar ten years ago but not much as changed so clearly we need someone to try again.

Modern parenting is preoccupied by the idea of perfection, and that includes weight. Virginia Sole-Smith, author of a brave and radical new book, talks to Rebecca Seal about why our worth shouldn’t be measured by size
Rebecca Seal (The Guardian)