hi there, it's great that you are lecturing him on proper eating habits that is what he needs to do and do it soon. if he's having constipation like this as a teenager i hate to see what his situation may be in 10 years if he doesn't change. as for quick relief try the enema for sure but also a salt water flush would work quickly too. you may need to look it up the proper recipe. just do a search here on salt water flush or SWF. basically you drink a quart of very salty warm water and it flushes your entire digestive track out from top to bottom. must be done on an empty stomach and works best first thing in the morning. it works in an under an hour for most and once you start eating the effects of it will subside.