I have a 16 son with CF. He has been lucky (not that he thinks so) until now with very few hospital admissions and reasonable health. He is now working as an apprentice motor mechanic which he loves. He is going through a rotten time of not taking enzymes, not eating, not doing any exercise or physio activity..he is now very under weight and is constantly sick..and just doesnt give a damn about himself..any tips on what what I can do (without being a nagging pain in the butt) to get him to take his enzymes, eat more and to realise if he doesnt start to take care of himself soon it could be too late?