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The iodine content of Norwegian foods and diets

  • Lisbeth Dahl (a1), Lars Johansson (a2), Kåre Julshamn (a1) and Helle Margrete Meltzer (a3)

Abstract

Objectives:

To examine dietary iodine sources and to estimate the dietary iodine intake of the Norwegian population.

Design:

Food iodine analyses carried out in Norway during the last 10 years were compiled, and iodine intake calculated on the basis of food intake data from nation-wide dietary surveys among children and adults. The food intake of adults was measured by a self-administrated food-frequency questionnaire, which covered habitual diet during the past year. The food intake of children was measured by dietary record during four consecutive days.

Setting:

Neither household nor industrial iodisation of salt is mandatory in Norway, but some brands of table salt have 5 μg of iodine added per gram of NaCl. In spite of this, the population has been considered iodine-replete for decades, i.e. having an iodine intake well above the Recommended Dietary Allowance of 150 μg day−1. This assumption has not been substantiated by dietary surveys.

Subjects:

The adults included 1374 females and 1298 males aged 16–79 years. The children included 185 girls and 206 boys aged 4 years, 411 girls and 404 boys aged 9 years, and 517 girls and 492 boys aged 13 years.

Results:

The calculated iodine intake was in the range of 100–250 μg day−1 in the majority of the adult population. The mean iodine intake was 136 μg day−1 (170 μg I/10 MJ) among women and 176 μg day−1 (161 μg I/10 MJ) among men. For children the iodine intake was in the range of 100–120 μg day−1. Milk and dairy products contributed approximately 55% and 70% of the dietary iodine intake in adults and children, respectively. Fish contributed more than 20% of the iodine intake in adults and about 10% in children. The iodine contribution of drinking water was negligible.

Conclusions:

While fish has the highest natural concentration of iodine and as such is an excellent iodine source, milk and diary products are the main determinants of iodine intake in the Norwegian population. Iodisation of cow fodder has been mandatory in Norway since 1950 and provides an efficient alternative to universal salt iodisation. Our results show that the dietary iodine intake of adults is in the range considered to be sufficient. The dietary intake of iodine was at recommended levels among the youngest children; however, it decreased among adolescents, especially among girls.

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Copyright

Corresponding author

*Corresponding author: Email lisbeth.dahl@nifes.no

References

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1Hetzel, BS. Iodine deficiency disorders (IDD) and their eradication. Lancet 1983; ii: 1126–9.
2Delange, F. The disorders induced by iodine deficiency. Thyroid 1994; 4: 107–28.
3Hetzel, BS. Eliminating iodine deficiency disorders – the role of the International Council in the global partnership. Bulletin of the World Health Organization 2002; 80 5: 410–3.
4World Health Organization (WHO)/United Nations Children's Fund/International Council for Control of Iodine Deficiency Disorders. Assessment of the Iodine Deficiency Disorders and Monitoring their Elimination. A Guide for Programme Managers, 2nd ed. WHO/NHD/01.1. Geneva: WHO, 2001.
5Devold, O, Batt, F, Closs, K, Backer, J. En strumaundersøkelse fra Modum. Norsk Magasin for Lagevitenskap 1937; 7: 900–37 [in Norwegian].
6Frey, H, Rosenlund, B, Try, K, Theodorsen, L. Urinary excretion of iodine in Norway. Delange, F, ed. Iodine Deficiency in Europe. New York: Plenum Press, 1993; 297300.
7 Ministry of Health. Generell forskrift for produksjon og frambud m.v. av næringsmidler [Regulation of General Production of Food Offered to Consumers, online], 2002. Available at http://www.snt.no/rettsregler/forskrifter /hd-19830708-1252.html [in Norwegian].
8 Ministry of Agriculture. Forskrift om fôrvarer [Regulation of Feeding Stuff, online], 2002. Available at from http://www.lovdata.no/for/sf/ld/ld-20021107-1290.html [in Norwegian].
9Julshamn, K, Dahl, L, Eckhoff, K. Determination of iodine in seafood by inductively coupled plasma/mass spectrometry. Journal of AOAC International 2001; 84: 1976–83.
10National Council on Nutrition and Physical Activity. Norske naringsstoffanbefalinger [Norwegian Nutrient Recommendations]. Oslo: National Council on Nutrition and Physical Activity, 1997; [in Norwegian].
11Sandström, B, Aro, A, Becker, W, Lyhne, N, Pedersen, JI, Pórsdóttir, I. Nordiska närings-rekommendationer 1996 [Nordic Nutrition Recommendations 1996]. Nord 1996; 28. Copenhagen: Nordic Council of Ministers, 1996 [in Swedish].
12Subcommittee of the Tenth Edition of the RDAs, Food and Nutrition Board Commission on Life Sciences, National Research Council. Iodine. In: Recommended Dietary Allowances. Washington, DC: National Academy Press, 1989; 213–6.
13 European Commission. Opinion of the Scientific Committee on Food on the Tolerable Upper Intake Level of Iodine [online]. Available at http://europa.eu.int/comm/food/fs/sc/scf/out146_en.pdf. Accessed 7 10 2002.
14Dahl, L, Opsahl, JA, Meltzer, HM, Julshamn, K. Iodine concentration in Norwegian milk and dairy products. British Journal of Nutrition 2003; 90: 679–85.
15Rimestad, AH, Borgejordet, Å, Norunn, KV, Sygnestveit, K, Løken, EB, Trygg, K, et al. Den store matvaretabellen [Norwegian Food Composition Table]. Oslo: Gyldendal undervisning, 2001 [in Norwegian].
16Fecher, PA, Goldmann, I, Nagengast, A. Determination of iodine in food samples by inductively coupled plasma mass spectrometry after alkaline extraction. Journal of Analytical Atomic Spectrometry 1998; 13: 977–82.
17Johansson, L, Solvoll, K. Norkost 1997. Landsomfattende kostholdsundersøkelse blant menn og kvinner i alderen 16–79 år [National Dietary Survey among Males and Females, 16–79 years]. Publication No. 2. Oslo: National Council on Nutrition and Physical Activity, 1999 [in Norwegian].
18Pollestad, M, Øverby, N, Andersen, L. Ungkost-2000. Kosthold blant 4-å ringer: Landsomfattende kostholdsundersøkelse [Dietary Intake among 4 years old Children]. Oslo: Directorate for Health and Social Affairs, Division of Nutrition, 2002 [in Norwegian].
19Øverby, N, Andersen, L. Ungkost-2000: Landsomfattende kostholdsundersøkelse blant elever i 4-og 8. klasse i Norge [National Dietary Survey among 4- and 8-grade Pupils in Norway]. Oslo: Directorate for Health and Social Affairs, Division of Nutrition, 2002 [in Norwegian].
20Nes, M, Frost, Andersen|L, Solvoll, K, Sandstad, B, Hustvedt, B, Løvø, A, et al. Accuracy of a quantitative food frequency questionnaire applied in elderly Norwegian women. European Journal of Clinical Nutrition 1992; 42: 809–21.
21Solvoll, K, Lund-Larsen, K, Søyland, E, Sandstad, B, Drevon, C. A quantitative food frequency questionnaire evaluated in a group of dermatologic outpatients. Scandinavian Journal of Nutrition 1993; 37: 150–5.
22Andersen, LF, Solvoll, K, Drevon, C. Very long-chain n – 3 fatty acids as biomarkers for intake of fish and n – 3 fatty acids concentrates. American Journal of Clinical Nutrition 1996; 64: 305–11.
23Andersen, LF, Solvoll, K, Johansson, LRK, Salminen, I, Aro, A, Drevon, CA. Evaluation of a food frequency questionnaire with weighed records, fatty acids and alpha-tocopherol in adipose tissue and serum. American Journal of Epidemiology 1999; 150: 7587.
24Rasmussen, LB, Larsen, EH, Ovesen, L. Iodine content in drinking water and other beverages in Denmark. European Journal of Clinical Nutrition 2000; 54: 5760.
25Pedersen, KM, Laurberg, P, Nøhr, S, Jorgensen, A, Andersen, S. Iodine in drinking water varies by more than 100-fold in Denmark. Importance for iodine content of infant formulas. European Journal of Endocrinology 1999; 140: 400–3.
26Häsänen, E. Iodine content of drinking water and diseases of circulatory system. Annales Medicinae Experimentalis et Biologiae Fenniae 1970; 48: 117–21.
27Felgentraeger, HJ. Zum jodgehaltes der umwelt in der DDR und seine beziehungen zum gesundheitzustand der bevolkerung. Zeitschrift für die gesamte Hygiene und ihre Grenzgebiete 1984; 30: 154–5 (in German).
28Andersen, S, Petersen, SB, Laurberg, P. Iodine in drinking water in Denmark is bound in humic substances. European Journal of Endocrinology 2002; 147: 663–70.
29Rasmussen, LB, Ovesen, L, Bülow, I, Jørgensen, T, Knudsen, N, Laurberg, P, et al. Dietary iodine intake and urinary iodine excretion in a Danish population: effect of geography, supplements and food choice. British Journal of Nutrition 2002; 87: 61–9.
30Wild, CP, Andersson, C, O'Brien, NM, Wilson, L, Woods, JA. A critical evaluation of the application of biomarkers in epidemiological studies on diet and health. British Journal of Nutrition 2001; 86: S37–53.
31Varo, P, Saari, E, Koivistoinen, P. Iodine in Finnish foods. International Journal for Vitamin and Nutrition Research 1982; 52: 80–9.
32 Ministry of Agriculture, Fisheries and Food. Iodine in Milk [online]. Food Surveillance Information Sheet No. 196, 2000. Available at http://www.food.gov.uk/science/surveillance/maffinfo/2000/maff-2000-198.
33Tokudome, S, Tokudome, Y, Moore, MA. Dietary iodine sources other than fish. European Journal of Clinical Nutrition 2002; 56: 467–8.
34Brussaard, JH, Hulshof, K, Lowik, MRH. Calculated iodine intake before and after simulated iodization (Dutch Nutrition Surveillance System). Annals of Nutrition & Metabolism 1995; 39: 8594.
35Manz, F, Böhmer, T, Gärtner, R, Grossklaus, R, Klett, M, Schneider, R. Quantification of iodine supply: representative data on intake and urinary excretion of iodine from the German population in 1996. Annals of Nutrition & Metabolism 2002; 46: 128–38.
36Lee, SM, Lewis, J, Buss, DH, Holcombe, GD, Lawrance, PR. Iodine in British foods and diets. British Journal of Nutrition 1994; 72: 435–46.
37Rose, M, Miller, P, Baxter, M, Appleton, G, Crews, H, Croasdale, M. Bromine and iodine in 1997 UK total diet study samples. Journal of Environmental Monitoring 2001; 3: 361–5.
38Ministry of Agriculture, Fisheries and Food (MAFF). Nutrient Analysis of Liquid Pasteurised Milk. Food Surveillance Information Sheet No. 128. London: HM Stationery Office.1997.
39Dahl, L, Meltzer, HM, Opsahl, JA, Julshamn, K. Iodine intake and status in two groups of Norwegians. Scandinavian Journal of Nutrition 2003; 47(4): 170–8.
40Vitti, P, Rago, T, Aghini-Lombardi, F, Pinhera, A. Iodine deficiency in Europe. Public Health Nutrition 2001; 4: 529–35.
41Vitti, P, Delange, F, Pincherra, A, Zimmermann, M, Dunn, JT. Europe is iodine deficient [correspondence]. Lancet 2003; 361: 1226.
42Franke, PA, Goldman, I, Osland, RB. Factors affecting iodine concentration of milk of individual cows. Journal of Dairy Science 1983; 66: 9971002.
43Galton, DM, Peterson, LG, Erb, HM. Milk iodine residues in herds practicing iodophors premilking teat disinfection. Journal of Dairy Science 1986; 69: 267–71.
44Phillips, DIW. Iodine, milk and the elimination of endemic goitre in Britain: the story of an accidental public health triumph. Journal of Epidemiology and Community Health 1997; 51: 391–3.
45Lightowler, HJ, Davies, GJ. Iodine intake and iodine deficiency in vegans as assessed by the duplicate-portion technique and urinary iodine excretion. British Journal of Nutrition 1998; 80: 529–35.
46Remer, T, Neubert, A, Manz, F. Increased risk of iodine deficiency with vegetarian nutrition. British Journal of Nutrition 1999; 81: 45–9.

Keywords

The iodine content of Norwegian foods and diets

  • Lisbeth Dahl (a1), Lars Johansson (a2), Kåre Julshamn (a1) and Helle Margrete Meltzer (a3)

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