Schools and Healthy eating

Ok so its really bugging me know with schools and their teachings of healthy eating and what they serve up at lunch time.

While on one hand I think that school dinners are far much better and tastier than when I was at school, they still aren't exactly the most healthiest of healthiest of meals for instance they still get chocolate cake for pudding.
But my problem is they serve up these meals yet in the classroom teachers discuss healthy living and how they shouldn't eat too much food and you shouldn't eat fatty food and shouldn't eat this and you shouldn't eat that because your get fat and that leads to obesity... While yes this is true don't brain wash my kid and then serve chocolate cake!!

But above all that's not my biggest moan of schools and their dinners v's healthy living. My biggest thing is that they concentrate in obesity and how kids today are fat and need to eat properly (again this is to a certain extent true) but no one is teaching them the other end of the scale and how not eating and being underweight is also just as unhealthy. Both my 2 oldest children now (middle mouselings when she was 8 and now the oldest mouseling aged 12) have gone from eating healthy meals to not wanting to eat anything in fear of becoming fat!! Twice now I have had to sit down and explain exercise also plays a part in staying healthy and some foods that nay be classed are high in fat are also ok due to the vitamins they contain and with food its all about moderation. I think its important that every angle is looked at when talking about this subject because eating disorders aren't nice and not giving children the facts especially those becoming teenagers and having hormones floating around is more dangerous than having obese kids!!!