What is the general role of antioxidants in the diet?

Antioxidants play a crucial role in protecting cells from oxidative damage caused by free radicals. Free radicals are unstable molecules that can harm cellular structures, proteins, and DNA, potentially leading to chronic diseases and aging. By neutralizing these free radicals, antioxidants help maintain cellular integrity and support overall health. This protective function is essential for preventing conditions such as heart disease, cancer, and neurodegenerative disorders.

The other options relate to functions that are not the primary role of antioxidants. For instance, while some nutrients are involved in energy production or muscle growth, these are typically associated with macronutrients and specific proteins rather than antioxidants. Similarly, calcium absorption is primarily facilitated by vitamin D and other compounds, not by antioxidants. Thus, the role of antioxidants is specifically centered around cellular protection from oxidative stress.