Ok half lighthearted but ...
Does your 16 year old eat like all the time? Mine seems to be eating as much as all of us together! Of course I know he's growing up and he needs the energy/nutrition, but he's putting a serious dent in my food budget 
I guess I'm just wondering if you try to manage this or just let him be? Do you say "no eating after 9 pm" for example? fed up of waking up to a pile of dirty plates in the sink