I nipped to my Asda leaving my 11 year old finishing dinner off, (I live 5 mins away from asda) and this morning I was cleaning my windows and noticed my son has been sneaking little chocolate bars and throwing wrappers out of the bedroom window there is 4/5 different wrappers in the gutter. I'm becoming concerned as this isn't the first time. Anything to do with sweets/cake he will sneak and over eat. I allowed a treat or two after dinner but not massive amounts. As I want him to have a healthy balanced diet. Is there anyone who's child is sneaking extra treats? I give him a well portioned dinner pasta/chicken and veg etc and he will eat all of that. And still sneak treats 
How do I talk with him about it, I've tried to explain he needs to eat healthy, and talk with him about portions etc but it doesn't seem to help