Iodine content of six fish species, Norwegian dairy products and hen’s egg

Nerhus, Ive; Markhus, Maria Wik; Nilsen, Bente M.; Øyen, Jannike; Maage, Amund; Ødegård, Elisabeth; Midtbø, Lisa Kolden; Frantzen, Sylvia; Kögel, Tanja; Graff, Ingvild Eide; Lie, Øyvind; Dahl, Lisbeth; Kjellevold, Marian

doi:10.29219/fnr.v62.1291

Cited by 71 publications

(69 citation statements)

References 25 publications

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“…Iodine concentrations in Atlantic cod (Table 2) were significantly higher than for other species with a GM of 6.32 mg/kg (ww) in muscle. High I content in Atlantic cod have been observed previously, such as a mean of 2.5 mg/kg (ww) in Barents Sea cod both in 2001 and 2018 21,26 . By comparison, Atlantic cod from the Norwegian Sea had a mean of 4.0 mg/kg and 0.96 mg/kg for those from the North Sea.…”

Section: Discussionsupporting

confidence: 55%

“…Since seawater contains more I than freshwater and since marine plants and marine prey are rich sources of I, higher amounts of this element are found in marine species especially in lean fish 26,29 in comparison to fatty marine fish like halibut, mackerel, sardine and herring. The reasons for this is still unknown 26,30 . The differences seen between and within species may thus be explained by differing diets, environments, ages and sizes.…”

Section: Discussionmentioning

confidence: 99%

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Iodine and bromine in fish consumed by indigenous peoples of the Russian Arctic

Sobolev

Aksenov

Sorokina

et al. 2020

Sci Rep

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Fish muscle may constitute one of the main sources of iodine (I) for the indigenous peoples of the Russian Arctic, although limited information is available about its content in commonly consumed fish species. In the current study, bromine (Br), I, the essential elements (copper, selenium and zinc) and other non-essential elements-specifically mercury, arsenic (As), cadmium, lead and nickel-have been quantified in 10 fish species consumed by people living in the Nenets and Chukotka Regions. Fish muscle was analysed by ICP-MS after nitric acid or tetramethylammonium hydroxide digestion. Certified reference materials were employed and concentrations are reported as geometric means (GMs). Atlantic cod (6.32 mg/kg) and navaga (0.934 mg/kg) contained substantially higher amounts of I than all other fish species, while broad whitefish had the lowest (0.033 mg/kg). By comparison, navaga contained more Br (14.5 mg/kg) than the other fish species, ranging 7.45 mg/kg in Atlantic cod to 2.39 mg/kg in northern pike. A significant inter-fish association between As and I in freshwater and marine fish was observed, suggesting common sources and perhaps parallel absorption patterns. Only Atlantic cod and, to lesser extent, navaga constituted significant dietary sources of I.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Iodine and bromine in fish consumed by indigenous peoples of the Russian Arctic

Sobolev

Aksenov

Sorokina

et al. 2020

Sci Rep

View full text Add to dashboard Cite

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“…), lean fish (cod, saithe, etc. ), sushi and cake, an average value for the food was calculated as reported in newly published studies on the iodine content in Norwegian foods [23,24]. When calculating the iodine intake by the 24-h recall, we multiplied food intakes with the iodine concentration in each food item and summed for all items.…”

Section: Iodine Intake From Food and Supplementsmentioning

confidence: 99%

Mild to Moderate Iodine Deficiency and Inadequate Iodine Intake in Lactating Women in the Inland Area of Norway

et al. 2020

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Breastfed infants are dependent on an adequate supply of iodine in human milk for the production of thyroid hormones, necessary for development of the brain. Despite the importance of iodine for infant health, data on Norwegian lactating women are scarce. We measured iodine intake and evaluated iodine status and iodine knowledge among lactating women. From October to December 2018, 133 mother–infant pairs were recruited in a cross-sectional study through two public health care centers in Lillehammer and Gjøvik. Each of the women provided two human milk specimens, which were pooled, and one urine sample for analysis of iodine concentration. We used 24-h dietary recall and food frequency questionnaire (FFQ) to estimate short-term and habitual iodine intake from food and supplements. The median (P25, P75) human milk iodine concentration (HMIC) was 71 (45, 127) µg/L—of which, 66% had HMIC <100 µg/L. The median (P25, P75) urinary iodine concentration (UIC) was 80 µg/L (52, 141). The mean (± SD) 24-h iodine intake and habitual intake was 78 ± 79 µg/day and 75 ± 73 µg/day, respectively. In conclusion, this study confirms inadequate iodine intake and insufficient iodine status among lactating women in the inland area of Norway and medium knowledge awareness about iodine.

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“…The evolutionary history of the domestic cat, originating from the Near Eastern desert region 37 , suggests that fish were never a common food source. Thus, the domestic cat may not be physiologically adapted to constituents found at high levels in fish, such as arsenic, mercury 44 and iodine 45,46 . In the present study, we were unable to determine diet histories and thus were unable to associate fish intake with kidney tissue arsenic content.…”

Section: Renal Histopathology and Prevalence Of Chronic Interstitialmentioning

confidence: 99%

Renal accumulation of prooxidant mineral elements and CKD in domestic cats

Alborough

Grau‐Roma

Brot

et al. 2020

Sci Rep

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felids have a high incidence of chronic kidney disease (cKD), for which the most common renal lesion is chronic interstitial nephritis (cin). cin can be induced by tissue oxidative stress, which is determined by the cellular balance of pro-and anti-oxidant metabolites. Fish-flavoured foods are more often fed to cats than dogs, and such foods tend to have higher arsenic content. Arsenic is a pro-oxidant metallic element. We propose that renal accumulation of pro-oxidant elements such as arsenic and depletion of anti-oxidant elements such as zinc, underpin the high incidence of cin in domestic cats. total arsenic and other redox-reactive metal elements were measured in kidneys (after acid-digestion) and urine (both by inductively-coupled plasma-mass spectrometry) of domestic cats (kidneys, n = 56; urine, n = 21), domestic dogs (kidneys, n = 54; urine, n = 28) and non-domesticated Scottish Wildcats (kidneys, n = 17). Renal lesions were graded by severity of CIN. In our randomly sampled population, CIN was more prevalent in domestic cat versus domestic dog (51%, n = 32 of 62 cats; 15%, 11 of 70 dogs were positive for cin, respectively). cin was absent from all Scottish wildcats. tissue and urinary (corrected for creatinine) arsenic content was higher in domestic cats, relative to domestic dogs and wildcats. Urine arsenic was higher in domestic cats and dogs with cin. Arsenobetaine, an organic and relatively harmless species of arsenic, was the primary form of arsenic found in pet foods. in summary, the kidneys of domestic cats appear to have greater levels of pro-oxidant trace elements, as compared to dogs and wildcats. Since there was no difference in renal arsenic levels in cats with or without CIN, renal arsenic accumulation does not appear a primary driver of excess CIN in cats. Given clear differences in renal handling of pro vs. anti-oxidant minerals between cats and dogs, further in vivo balance studies are warranted. These may then inform species-specific guidelines for trace element incorporation into commercial diets.Chronic kidney disease (CKD) is commonly diagnosed in domestic cats, with a reported prevalence of 1-3% in the overall domestic cat population 1 . One study reported prevalence as high as 50% and 80% in cats of all ages and aged over 15 years, respectively 2 . This contrasts to a reported prevalence of <1% in all dogs 3 and only 10% in dogs over 15 years of age 1 . CKD is defined as the irreversible loss of structure and/or function of one or both kidneys that results from a progressive process occurring over a period of 3 months or more 1 . CKD has various aetiologies, but mononuclear cell tubulointerstitial nephritis -inflammation of the interstitial cells surrounding tubules, predominantly proximal -together with interstitial fibrosis and tubular atrophy is the common histopathological finding in most cases of CKD in cats 4,5 and dogs 6 .Renal tubular epithelial cells are highly metabolically active with high mitochondrial density in order to support oxidative phosphorylation and energy-depe...

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Iodine content of six fish species, Norwegian dairy products and hen’s egg

Cited by 71 publications

References 25 publications

Iodine and bromine in fish consumed by indigenous peoples of the Russian Arctic

Iodine and bromine in fish consumed by indigenous peoples of the Russian Arctic

Mild to Moderate Iodine Deficiency and Inadequate Iodine Intake in Lactating Women in the Inland Area of Norway

Renal accumulation of prooxidant mineral elements and CKD in domestic cats

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