Which nutrient is critical for the body's immune function?

Protein is essential for the body's immune function because it plays a crucial role in the formation of antibodies and other immune-system components. Antibodies are specialized proteins that recognize and neutralize pathogens such as viruses and bacteria, helping to protect the body from infections. Furthermore, protein is necessary for the production of various immune cells, including T-cells and cytokines, which are vital for a robust immune response. Without adequate protein intake, the body may not be able to effectively mount an immune response, leading to an increased susceptibility to illness and a longer recovery time.

While fats, carbohydrates, and fiber are important nutrients for various bodily functions, including energy production, digestive health, and overall well-being, they do not have the same direct role in immune system function as protein. Therefore, focusing on adequate protein consumption is essential for maintaining a healthy immune system.