Bioavailability of iodine from normal diets rich in dairy products--results of balance studies in women.
During the last decade the iodine supply in Germany has increased significantly, but there is still a high frequency of goitre. Therefore the question of iodine bioavailability has arisen. In a two-period study 12 women were given a mixed diet of ordinary foods with milk and milk products of different batches. None of the volunteers suffered from an iodine deficiency according to WHO-criteria. Each period ended with a 9-day balance-study protocol in which all foods were provided. Food and fluid intake were registered, and urine and faeces were quantitatively collected. The iodine content was determined by ICP-MS. The mean intake in the form of solid food amounted to 175 +/- 10 micrograms I/d and to 27 +/- 15 micrograms I/d in fluid form. Milk and dairy products represented the main source of iodine (37%). Iodine was predominantly excreted in the urine (89%, 171 +/- 45 micrograms I/d) and the faeces 11% (20 +/- 11 micrograms I/d). The resulting iodine balance was approximately . In one case an iodine-rich erythrosine preparation with a low iodine bioavailability was used. Between the two periods of consuming different batches of milk and milk products no differences were observed concerning the high bioavailability of iodine.
Jahreis
G
G
Institute of Nutrition, Friedrich Schiller University Jena, Germany. b6jage@rz.uni-jena.de
Hausmann
W
W
Kiessling
G
G
Franke
K
K
Leiterer
M
M
D000328:Adult; D000818:Animals; D001682:Biological Availability; D002611:Cheese; D003611:Dairy Products; D004032:Diet; D005243:Feces / Q000737:chemistry; D005260:Female; D005502:Food; D006801:Humans; D007455:Iodine / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000652:urine; D008460:Meat; D008892:Milk / Q000737:chemistry; D015014:Yogurt
D007455:Iodine