Selenium Deficiency and Immune Function

Less systemic inflammation. Better immune function. Selenium is an essential trace element. Our cells cannot synthesize it. We must get it as a part of our diets. Adequate intakes are necessary for optimal immune system function.

Man in wheelchair at the beach
Autoimmune diseases develop when our own immune system malfunctions and attacks our cells. Then we suffer from autoimmune thyroid disorders, lupus, multiple sclerosis, psoriasis, rheumatoid arthritis or a hundred other autoimmune diseases.

Unfortunately, many of us live in regions with selenium-poor soil and selenium-poor crops and fruits. We do not get sufficient selenium from our food [Stoffaneller & Morse 2015]. Adequate selenium intake and status are vital. There are increased health risks associated with selenium deficiency.

What Defines Selenium Deficiency?

Data from the BIOSTAT-CHF observational cohort study indicate that serum selenium concentrations under 70 mcg/L constitute a deficiency status. Serum selenium concentrations under 100 mcg/L constitute a sub-optimal status [Bomer 2020]. read more

Antioxidant Action of Selenium and Selenoproteins

Antioxidants. Several selenoproteins play important roles as antioxidant enzymes in the protection of the cells and the mitochondria against the oxidative damage caused by harmful free radicals. Prominent among the antioxidant seleno-enzymes are the glutathione peroxidases and the thioredoxin reductases [Alehagen 2022].

Professor Urban Alehagen
Professor Urban Alehagen, the lead researcher on the KiSel-10 Study, estimates that a daily selenium intake of 110-150 mcg per day is necessary to achieve optimal expression of selenoprotein P, one of the most important selenoproteins in the plasma and the main transporter of selenium in the blood [Alehagen 2022].
Note: Oxidative stress is the bio-medical term for an imbalance in the relationship of 1) harmful free radicals, mostly of the reactive oxygen species, and 2) protective antioxidants, which should neutralize the harmful free radicals.

In many regions of the world, notably in much of Europe and the Middle East, there is selenium-poor soil and selenium-poor foodstuffs. In Sweden, for example, the average daily intake of selenium among senior citizens
is approximately 35 mcg/day, well below the amounts (110–150 mcg/day) needed for an optimal expression of the selenoprotein antioxidants [Alehagen 2022].
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