What role does selenium play in the diet?

Selenium is an essential trace mineral that plays a critical role in several physiological functions within the body, particularly in its capacity to assist in antioxidant defense. Antioxidants are substances that help neutralize free radicals, which are reactive molecules that can cause oxidative damage to cells and lead to various health issues, including chronic diseases and aging. Selenium is a vital component of various antioxidant enzymes, including glutathione peroxidases, which protect cells from oxidative stress.

By enhancing the body’s ability to combat oxidative damage, selenium helps maintain overall health and supports immune function. While the other options mention important functions related to nutrition and physical health, they do not accurately reflect the specific role of selenium in the diet. Therefore, the correct choice focuses on selenium's crucial involvement in antioxidant defense mechanisms, highlighting its importance in promoting overall wellness and preventing cellular damage.