Genetic potential is not destiny. Even individuals with less favorable alleles can enhance immune function by consistently practicing healthy lifestyle habits, including a balanced diet , regular exercise , and sufficient sleep , which positively modulate genes such as IL10 (anti-inflammatory regulation), SIRT1 (metabolic regulation), and FOXO3 (cellular stress resistance). Beyond basic habits, effective stress management and optimal hydration play crucial roles in supporting immune homeostasis and cellular resilience. Key regulatory genes such as NRF2 (oxidative stress defense), NFKB1 (inflammatory signaling), and IL10 (anti-inflammatory regulation) are influenced by proper cortisol control, nutrient availability, and fluid balance, reinforcing the body's ability to respond efficiently to infections and maintain systemic health over time. Many everyday habits and environmental co...