Iodide excretion before and after revision of goiter prophylaxis (Dutch Nutrition Surveillance System)
1992
Brug, J. | Lowik, M.R.H. | Wedel, M. | Odink, J.
To assess the iodine supply in The Netherlands after the revision of the goiter prophylaxis measures (Bread Act of 1982, with an increase of iodine content of bread salt) the data of a nationwide survey among Dutch elderly people conducted in 1984/1985 were analysed. Iodide excretion in 24 h urine samples was used as the main iodine status indicator. The data were compared with data on iodine nutriture obtained among an elderly population in The Netherlands before the revision of goiter prophylaxis. High prevalences (greater than or equal to 37%) of low iodine excretion (< 0.78 micromole/24 h; 100 microgram/24 h) were found for Dutch elderly people. Mean urinary iodide excretion was 0.95 micromole 24 h (121 microgram/24 h) for men and 0.79 micromole/24 h (100 microgram/24 h) for women which is low, especially among women, in comparison with the United States recommended dietary allowance (118 micromole/day = 150 microgram/day). Consistent positive associations of iodide excretion were found with urinary potassium and sodium excretion, bread consumption and total iodine intake. Bread, as the iodine carrier chosen for goiter prophylaxis in The Netherlands, was found to be the main dietary iodine source. No improvement in iodine nutrition was found among the elderly studied in 1984/1985 in comparison with an elderly population seen in 1981. Therefore, it is concluded that the present measures regarding goiter prophylaxis in The Netherlands might be of limited effectiveness.
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