Blood selenium levels and contribution of food groups to selenium intake in adolescent girls in Iceland

Abstract

Background/objectivesSignificant changes have been reported in dietary habits and food availability in Iceland that would be expected to compromise selenium intake and status, especially among young people. These include substantial decreases in the consumption of fish and milk, as well as the selenium content of imported wheat. The aim of this study was to assess selenium in the diet and whole blood of adolescent girls, as well as define the most important foods contributing to intake and blood concentrations of selenium.DesignThe subjects were 96 randomly selected girls, aged 16–20, who answered a validated food frequency questionnaire (FFQ) for dietary assessment. Selenium intake from each food group was calculated in µg/day. Blood samples were collected for measurement of whole blood selenium.ResultsMean dietary selenium was 51±25 µg/day. Milk/dairy products, including cheese, contributed 36±14% of total dietary selenium; fish 18±12%; and bread/cereal products 13±6%. Mean whole blood selenium was 117±12 µg/l (range 90–208); nearly 90% of subjects were above the optimal level of 100 µg/l. Fish and bread/cereal products were the only foods significantly correlated with selenium in blood (r=0.32; P=0.002 and r=0.22; P=0.04, respectively) while no correlation was found with milk and dairy products in spite of their greater contribution to total selenium intake.ConclusionIn this population of Icelandic adolescent girls, selenium intake and status seem acceptable. Judging from associations between intake and blood levels, fish and cereals may be the most important contributors to blood selenium.

Biomarkers of exposure to molybdenum and other metals in relation to testosterone among men from the United States National Health and Nutrition Examination Survey 2011–2012

“…Although these biomarkers of Pb are correlated, urinary Pb does not predict blood Pb (55), possibly explaining why we did not find an association between urinary Pb and testosterone. On the other hand, blood Se is believed to reflect long-term exposure better than serum Se (56), possibly explaining why we did not find an association between serum Se and testosterone if long-term exposure is more important in relation to testosterone. The selection of the appropriate exposure biomarker, whether in blood, urine, or other human tissues or fluids, should be carefully considered when conducting future epidemiology studies of these and other metals in relation to testosterone.…”

Grupo sanguíneo, alimentación y sobrepeso/obesidad: Una Miscelánea

“…Un total de 11 artículos fueron identificados en la búsqueda, cinco fueron científicos 11,12,13,14,15 de los cuales de eliminaron tres 11,12,13 por no incluir una de las tres variables y seis estudios teóricos 6,7,8,16,17,18 de los cuales se excluyeron dos 6,8 por no contar con los criterios de inclusión de la relación entre el grupo sanguíneo con al menos una de las dos variables (Figura 1.1).…”

Selenium‐Enriched Breads and Their Benefits in Human Nutrition and Health as Affected by Agronomic, Milling, and Baking Factors

“…Human dietary intervention studies have demonstrated the potential of Se‐enriched wheat and bread products to increase its biomarkers (Hart et al 2011). Se intake (0.04–200 μg/g) in wheat and bread administrated for several weeks (1–9 weeks) was highly bioavailable because it increased both blood Se and GPx levels (Bryszewska et al 2007; Gudmundsdottir et al 2012; Belobrajdic and Bird 2013; Hurst et al 2013). The Se associated with bread has been particularly well retained by various body tissues (Hart et al 2011; Thiry et al 2012).…”

“…The area of the circles represents the relative yearly per capita consumption of baked goods, and the red circles denote those countries where baked goods are among the five most relevant foods contributing selenium. Information obtained from Hussein and Bruggeman (1999), Klapec et al (2004), Ramiro‐Anaya (2004), Ventura et al (2007), Navarro‐Alarcon and Cabrera‐Vique (2008), Al‐Ahmary et al (2009), Choi et al (2009), Jenny‐Burri et al (2010), Sioen et al (2010), Támas et al (2010), Fairweather‐Tait et al (2011), Al‐Othman et al (2012), Gudmundsdottir et al (2012), Rayman (2012), Sigrist et al (2012), Beladel et al (2013), Souza et al (2013), Jablonska et al (2013), Waegeneers et al (2013), FAO (2013), Euromonitor International (2013), Joy et al (2014), and Navia et al (2014). MEA = Middle East and Africa.…”