The relationship between nutrition and immune function is crucial for maintaining health. Proper nutrition provides essential vitamins, minerals, and macronutrients that support the immune system. Nutrients like vitamin C, vitamin D, and zinc play a direct role in enhancing immune response and fighting infections. A balanced diet rich in fruits, vegetables, and whole grains can promote gut health, which is also linked to immune function. Poor nutrition can lead to deficiencies that weaken the immune system and increase susceptibility to illness.