If you want to maintain health,it is very important to live a scientific way.This way includes accepting food and drinks,healthy life style and working habits.First,one must eat as much fresh fruits and vegetables as possible,and eat as little meat,sugar,butter,cakes,and chocalates as possible.In the same time,do not drink too much coffee,especially before going to bed.Of course,not staying late into the evening is also a way to ensure you having 8 hours sleep.