Data from an observational study done in the United States have shown the following relationships [Reja 2020]:
Higher serum selenium status is correlated with lower risk of advanced liver fibrosis.
This correlation is especially strong in liver disease patients who are elderly, who are non-Hispanic white, or who are female.
The patients with non-alcoholic fatty liver disease (NAFLD) who had higher serum selenium levels also had a 28% lower hazard ratio of death from all causes compared to the NAFLD patients with the lowest serum selenium levels.
Serum Selenium Levels and the Risk of Advanced Liver Fibrosis and All-Cause Mortality in NAFLD Patients
On its Selenium: Fact Sheet for Health Professionals website, the US Office of Dietary Supplements, an agency of the National Institutes of Health, writes that selenium might play a role in the prevention of cancer for the following reasons:
selenium’s role in DNA repair
selenium’s role in apoptosis
selenium’s role in the endocrine and immune systems
the antioxidant properties of certain selenoproteins
Different Selenium Compounds Have Different Effects on Cancer
The evidence from scientific research into the effect of selenium on cancer prevention can be confusing. Two observations about selenium supplementation may help to explain the confusing results from existing selenium and cancer studies:
1. Different selenium containing compounds differ widely in their ability to prevent cancer. Study results may vary according to the form of the selenium supplement tested.
2. Selenium supplementation may be more effective at cancer prevention in study participants with low baseline selenium status (below 100 mcg/L) and less effective in study participants with high baseline selenium status (above 135 mcg/L).read more
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