The connection between nutrition and immune defense is profound, as certain nutrients, including vitamins A, C, D, and minerals like zinc, are essential for maintaining a robust immune system. A balanced diet rich in fruits, vegetables, whole grains, and lean proteins provides the necessary antioxidants and anti-inflammatory properties to help protect against infections. Additionally, optimal nutrition supports the production of white blood cells and antibodies, crucial for identifying and eliminating pathogens. Poor dietary choices can compromise immune function, making individuals more susceptible to illnesses and infections.