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Today's Daily Health Tip
Selenium
by Matt Anderson   Each week, we bring you a new ingredient that you can use to improve your health. This week, we're looking at selenium, a trace mineral that is essential to good health.
What Is It?
Selenium is an important trace mineral that helps your body make selenoproteins, a group of some 30 antioxidant enzymes (including four variants of glutathione peroxidase) that help prevent cellular damage from free radicals. These antioxidant enzymes also help regulate thyroid function and play an important role in the immune system.1
Low levels of selenium have been connected to death from heart disease, breast cancer, prostate cancer, colon cancer, and in fact cancer of all kinds. Some studies have shown that selenium may be 50-100 times more powerful than any other anti-carcinogen known. Selenium deficiency may also contribute to hypothyroidism and rheumatoid arthritis. Selenium as an antioxidant helps relieve the symptoms of arthritis by controlling the levels of free radicals that can harm healthy tissue.
Selenium is a component of glutathione peroxidases, which are primarily responsible for reducing peroxide free radicals that include lipid peroxide formation in cell membranes. Reduction of peroxides breaks the auto-oxidative chain reaction that damages cell membranes. Selenium is synergistic with glutathione and catalase in helping to protect the integrity of cell membranes. It stops the growth of tumors, and it protects the liver.
Where Is It Found?
Plant foods are the major dietary sources of selenium in most countries throughout the world. The content of selenium in food depends on the selenium content of the soil where plants are grown or animals are raised. Selenium also can be found in some meats and seafood. Animals that eat grains or plants that were grown in selenium-rich soil have higher levels of selenium in their muscle.1
Food sources provide selenium in either an inorganic form (selenite or selenate) or in an organic form where it displaces sulfur in methionine or cysteine. Compared to the inorganic form, the organic, readily useable methylselenocysteine form is able to virtually double selenium levels with no concerns about toxicity and improve absorbability at the same time.
Plants grow just fine without selenium in the soil. However, this means that no matter how naturally something is grown, and no matter how natural it is when you eat it, if there was no selenium in the soil when it was grown, it will be selenium deficient. The bottom line is that selenium is hardly constant in food -- appearing only in foods grown in selenium rich soils. Brazil nuts can contain anywhere from 0 to 550 micrograms per ounce. That's anywhere from 0 to 2/3 of the DV for selenium per ounce, depending on the soil the nuts are grown in.
The good news is that your body only requires a small amount of selenium to maintain good health. For more information about trace minerals, check out Jon Barron's special report on Catalyst Altered Trace Minerals.
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1. http://ods.od.nih.gov/factsheets/selenium |
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