All of the following are keys to a healthy immune system, except __________.

• A. Ergonomics
• B. Sleep
• C. Nutrition
• D. Exercise

Answer: (A)

Maintaining a healthy immune system is supported by sleep, nutrition, and regular exercise. Adequate sleep helps immune cells function and recover; proper nutrition provides the vitamins and minerals needed for effective immune responses; and regular exercise improves circulation and immune surveillance, while reducing chronic inflammation. Ergonomics, which focuses on designing comfortable and efficient workspaces to prevent strain, doesn’t directly strengthen immune function, even though it can improve overall well-being and reduce stress-related factors indirectly. So ergonomics is the exception.