Are ovo-lacto-pesco-vegetarians and vegans risk groups for suboptimal iodine intake? Iodine intake and status in a group of Norwegian vegetarians

  • Johansen_Nina_MAME5910_2016.pdf (3M)

Forfatter(e)

Utgivelsesdato

2016

Serie/Rapportnr.

MAEH;2016

Utgiver

Høgskolen i Oslo og Akershus. Institutt for sykepleie og helsefremmende arbeid

Dokumenttype

Masterprogram

Master i samfunnsernæring

Sammendrag

BACKGROUND: Iodine is a trace mineral of vital importance for brain development and function. Vegetarians generally avoid or limit their consumption of animal foods. Salt iodization in Norway is exceptionally low, and approximately 80% of dietary iodine derives from animal foods, with milk, seafood and eggs as the main sources. The iodine status in Norwegian vegetarians is unknown. OBJECTIVE: The main objective was to evaluate iodine intake and status of a group of Norwegian vegetarians. METHOD: Two day food diaries and morning spot urine samples for analysis of iodine concentration (UIC) were obtained from 52 vegetarians (including 18 vegans and 34 ovo-lactopesco-( OLP-) vegetarians) and 67 non-vegetarians (control group). Use of iodine containing supplements was reported, and evaluated in addition to the contribution of iodine from food. RESULTS: None of the vegans and 24% of OLP-vegetarians reached the recommended iodine intake of 150 μg/day with diet as the only source of iodine. Use of iodine-containing supplements was reported by 18% and 28% of OLP-vegetarians and vegans, respectively. When including iodine from supplements, 17% of vegans and 38% of OLPvegetarians reached the recommended intake of 150 μg/day. According to WHOs criteria for evaluating iodine status based on spot urine samples only 12% of vegans and 21% of OLPvegetarians had adequate iodine intake. In the total vegetarian group, the median urinary iodine concentration was 52 μg/L in noniodine- supplement and 102 μg/L in supplement users. High UIC (>700 μg/L) was found in three vegetarians using kelp supplements. Total iodine intake (food and supplements) did not differ between vegetarians and controls. CONCLUSION: This study showed that suboptimal iodine intake was prevalent in vegans, OLP-vegetarians and non-vegetarians. Although the participants are not representative groups of all vegetarians in the Norwegian population, the results highlight the need to focus on iodine nutrition in subgroups of the population

Emneord

Permanent URL

  • http://hdl.handle.net/10642/3342