In my honest opinion, the school should definately do it on an anonymous level. These letters should be sent to the parents of the kids.
BUT.............
If this is going to be done, the government should be involved 100%. If these parents dont react within a specified time, social services should be involved.
At the end of the day, the child (who knows no better, mind you) is being abused. If it is the parents who are feeding them and allowing them to get fat, its THEIR fault. If its the school thats feeding them crap and not offering PE, they should be fined. If it is a medical condition, its the parents fault, they should be taking the kid to the doctor and rectifying this issue.
A child, in any country in the world, has the right to be looked after, both emotionally and physically, NO MATTER WHAT!!! To allow the child to get fat is wrong, and so is the schools feeding them crap, and so is not taking them to the doctor when you can see there is a problem. And if all those avenues have been approached, then its the doctors fault for not informing the parents.
I dont see how any one here can sit back and honestly say that a 6 year old kid must get over the teasing, must decide for themselves what is good and bad to eat, can set up an exercise routine for themselves, etc. It is ridiculous! I might as well say to my 2 year old "hey, start early! You must now decide what you are going to eat and how you are going to exercise!" He will be eating icecream and cake all day, and watching TV!!! And why shouldnt he do those things? He does not understand the concept of responsibility, and even though a 6 year old has an understanding of responsibility, how can it extend to food and exercise when there are other "more important" things at that age? Like jewellery and makeup and dress up for a girl and cars and video games for a boy? Why are we talking of robbing them of their child hood because their parents are willing to step up to the plate? That is what social services are for right? And if social services are too busy to handle queries like that, then what the hell are schools doing by doing this when there is no repocussions?
Come on now people!!! We are parents for a reason! Regardless of what religion you belong to, parents are put on this earth to look after and nurture their kids, emotionally, physically, in every possible way! I will not stand back and say I leave all responsibility to the victim! We might as well get rid of all the parents out there and call women "baby carriers" and men "sperm suppliers"! If you are not adult enough to do the job of parenting, dont have sex in the first place!!! Simple!