Immune function

# Immune Function Domain Description

Immune function encompasses the body's integrated system of defense mechanisms that protect against infection, disease, and cellular damage. This domain includes innate immunity (the body's first-line defense against pathogens), adaptive immunity (the targeted response to specific threats), and immune tolerance (the ability to distinguish between harmful invaders and beneficial self-cells). Optimal immune function is fundamental to health and longevity, influencing susceptibility to infections, autoimmune conditions, chronic inflammation, and even cancer risk. The immune system does not operate in isolation—it is deeply interconnected with sleep quality, stress management, nutritional status, physical activity, and gut health. Supporting immune function has become increasingly important as evidence accumulates showing that chronic immune dysregulation contributes to multiple disease states including cardiovascular disease, metabolic disorders, and neurodegenerative conditions.