Comparison b e tween performed on t h e v a l i d i t y of serum-gamma-glutamyltransferase (S-GT) and serum-alkaline phosphatase (S-ALP) c o n c e n t r a t i o n s f o r e s t a b l i s h i n gt h e i n c r e a s e d a l c o h o l i n t a k e i n a group of middle-aged men i n Uppsala. These men were a l l born i n 1915 and were p a r t i c i p a n t s of a s p e c i a l h e a l t h i n v e s t i g at i o n performed a t t h e i r age of 60 y e a r s . S u b j e c t s who were r e g i s t e r e d a t t h e