In a prospective study of about 22,000 men attending a well person screening centre, serum samples were collected and stored. The concentration of retinol was measured in the stored serum samples from 227 men subsequently notified as having cancer and from 454 unaffected controls, matched for age, smoking history and duration of storage of the serum samples. The mean serum retinol concentration...

CONTENTS I N T R O D U C T I O N . VITAMIN A A N D CAROTENOIDS . FOOD SOURCES , ABSORPTION AND TRANSPORT . CONVERSION O F CAROTENOIDS T O RETINOL . C O N C L U S I O N S . . V I T A M I N D . FOOD SOURCES . ABSORPTION . . PHYSIOLOGICAL C O N D I T I O N . C O N C L U S I O N S . . V I T A M I N E . FOOD SOURCES . ABSORPTION, T R A N S P O R T A N D METABOLISM . FACTORS I N F L U E N C I N G BIO...

BACKGROUND Inuit traditional food provides ample amounts of preformed vitamin A. However, the dietary transition away from traditional food raises concerns regarding dietary adequacy. Vitamin A is an essential nutrient with inadequate and excessive exposures having adverse effects. OBJECTIVE To evaluate total dietary vitamin A intake for Canadian Inuit from market food and traditional food so...

1. Seasonal variations in plasma retinol-binding holoprotein concentration have been found in two groups of entire ewes and in a control group of wethers (castrated rams). 2. In each group retinol-binding holoprotein level was minimal in summer and increased to peak values in September just before the autumn breeding season.