Dietary sources of selenium
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Selenium in the Diet: Key Food Sources
Selenium is an essential micronutrient found in both plant and animal foods. The main dietary sources of selenium for humans are plants, especially those that can accumulate organic selenium in their edible parts, such as leaves, flowers, fruits, seeds, and sprouts. These plant-based foods can be consumed directly or after processing into products like oils and wines. Animal products, including meat, eggs, and dairy, also provide selenium, particularly when the animals are fed selenium-rich diets, resulting in selenium-enriched meat and other animal-derived foods 2467.
Organic vs. Inorganic Selenium in Foods
Selenium in food exists in both organic and inorganic forms. The organic forms, such as selenomethionine and selenocysteine, are more easily absorbed and utilized by the human body compared to inorganic forms like selenite and selenate. Organic selenium is commonly found in plant foods and selenium-enriched yeast, while inorganic forms are often used in dietary supplements and animal feed 2356+2 MORE.
Plant-Based Dietary Sources of Selenium
Many plants, especially those grown in selenium-rich soils or biofortified through agricultural practices, are significant sources of dietary selenium. For example, radishes grown in selenite-enriched environments contain high levels of bioavailable organic selenium compounds, such as selenocystine, selenomethionine, and Se-methylselenocysteine. These forms remain stable and bioaccessible after digestion, making selenium-enriched radishes a good dietary supplement option 236.
Animal-Based Dietary Sources of Selenium
Animal products are another important source of selenium, especially when animals are fed selenium-enriched diets. Meat, eggs, and dairy from such animals have higher selenium content, particularly in the organic form, which is more beneficial for human absorption. Studies in pigs, broilers, and fish show that organic selenium sources (like selenomethionine or selenium-enriched yeast) lead to higher selenium retention in tissues compared to inorganic sources 2579+1 MORE.
Selenium-Enriched Foods and Supplements
To address selenium deficiency, biofortification strategies are used to produce selenium-enriched foods. This includes fortifying crops and animal feeds with selenium, resulting in higher selenium content in the final food products. Selenium-enriched yeast and selenium-fortified animal products are commonly used as dietary supplements to improve selenium intake 2467+1 MORE.
Regional Variations in Selenium Intake
Selenium intake can vary greatly depending on the region and the selenium content of local soils and foods. For example, studies in the Kurdistan region of Northern Iraq have measured selenium concentrations in local foods to assess dietary intake and address potential deficiencies .
Conclusion
Selenium is available in a variety of dietary sources, with plants and animal products being the most significant contributors. Organic forms of selenium, found in selenium-enriched plants and animal products, are more bioavailable and beneficial for health. Biofortification and supplementation strategies are important for populations at risk of selenium deficiency, ensuring adequate intake through a diverse diet.
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Most relevant research papers on this topic
Optimum dietary sources and levels of selenium improves growth, antioxidant status, and disease resistance: re-evaluation in a farmed fish species, Nile tilapia (Oreochromis niloticus).
Optimal dietary selenium levels of 1.0 mg Se/kg organic Se in Nile tilapia feed improve growth performance, antioxidant status, immune response, and disease resistance.
Current Knowledge on Selenium Biofortification to Improve the Nutraceutical Profile of Food: A Comprehensive Review
Selenium biofortification in plants and animals can improve the nutraceutical profile of foods, potentially benefiting human health and promoting secondary metabolite production.
Selenium species bioaccessibility in enriched radish (Raphanus sativus): a potential dietary source of selenium.
Radish enriched in selenite shows high bioavailability of selenium species, making it a potential dietary source and animal feed for organoselenium supplements.
Iodine and selenium: Dietary sources and nutritional status of the population of the Kurdistan Region in Northern Iraq.
Iodized salt contributes to dietary iodine intake in the Kurdistan Region of northern Iraq, but selenium levels are low.
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