Dietary selenium is mainly used to provide raw materials for the synthesis of the important amino acid selenocysteine ??of selenoproteins, and selenoproteins (or selenium-containing enzymes) play a very important physiological role in the human body. From basic research, selenoproteins (selenoenzymes) do have the effect of preventing cancer and inhibiting cancer growth. The mechanisms mostly involve protecting DNA damage, resisting oxidation, and scavenging reactive oxygen species.

There is a lot of laboratory theoretical evidence that eating more foods high in selenium can prevent cancer, but the evidence accumulated in epidemiological surveys and studies in the past few decades is insufficient, so we can only say You should eat more selenium-rich foods every day to meet the body's needs for amino acids, which is helpful for health.