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Dietary iodine intake and urinary iodine excretion in a Danish population: effect of geography, supplements and food choice

Published online by Cambridge University Press:  09 March 2007

Lone B. Rasmussen ,
Lars Ovesen ,
Inge Bülow ,
Torben Jørgensen ,
Nils Knudsen ,
Peter Laurberg  and
Hans Perrild
Lone B. Rasmussen*
Affiliation:
Institute of Food Research and Nutrition, Danish Veterinary and Food Administration, Mørkhøj Bygade 19, DK-2860 Søborg, Denmark
Lars Ovesen
Affiliation:
Institute of Food Research and Nutrition, Danish Veterinary and Food Administration, Mørkhøj Bygade 19, DK-2860 Søborg, Denmark
Inge Bülow
Affiliation:
Department of Endocrinology, Aalborg Hospital, 9100, Aalborg, Denmark
Torben Jørgensen
Affiliation:
Centre for Preventive Medicine, Glostrup Hospital, 2600, Glostrup, Denmark
Nils Knudsen
Affiliation:
Centre for Preventive Medicine, Glostrup Hospital, 2600, Glostrup, Denmark Department of Internal Medicine I, Bispebjerg Hospital, 2400, Copenhagen NV, Denmark
Peter Laurberg
Affiliation:
Department of Endocrinology, Aalborg Hospital, 9100, Aalborg, Denmark
Hans Perrild
Affiliation:
Department of Internal Medicine I, Bispebjerg Hospital, 2400, Copenhagen NV, Denmark
*
*Corresponding author: Dr Lone Banke Rasmussen, fax +45 33 95 66 96, email lbr@fdir.dk
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Abstract

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I deficiency diseases remain a health problem even in some developed countries. Therefore, measurement of I intake and knowledge about food choice related to I intake is important. We examined I intake in 4649 randomly selected participants from two cities in Denmark (Copenhagen and Aalborg) with an expected difference in I intake. I intake was assessed both by a food frequency questionnaire and by measuring I in casual urine samples. I excretion was expressed as a concentration and as estimated 24-h I excretion. Further, subgroups with low I intake were recognized. I intake was lower in Aalborg than in Copenhagen for all expressions, and lower than recommended in both cities if I intake from supplements was not included. Milk was the most important I source, accounting for about 44 % of the I intake, and milk (P<0·001) and fish (P=0·009) intake was related to I excretion in a multiple linear regression model. Thus, risk groups for low I intake were individuals with a low milk intake, those with a low intake of fish and milk, those not taking I supplements and those living in Aalborg where the I content in drinking water is lower. Even individuals who followed the advice regarding intake of 200–300 g fish/week and 0·5 litres milk/d had an intake below the recommended level if living in Aalborg.

Keywords

Iodine intakeIodine excretionRisk for low iodine intake
Type
Research Article
Information
British Journal of Nutrition , Volume 87 , Issue 1 , January 2002 , pp. 61 - 69
Copyright
Copyright © The Nutrition Society 2002

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