I just caught DS2 eating food out of the kitchen bin. 
He is 8 and has LDs and ASD (quite low functioning). I had popped upstairs to the loo and when I returned he was getting leftover toast out of the bin! Ugh.
I feel terrible. I feed him enough. He's overweight actually, but the fact he was rooting in a bin for food makes me feel awful. Plus I couldn't hide my revulsion that he had actually eaten some of it.