Why Do we Fall Ill — Science STD 9 — Question

According to $WHO,$ “health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”
Health may be improved by promoting healthy behaviours like regular physical activity and getting enough sleep, as well as limiting or avoiding unhealthy activities like smoking or excessive stress.
Hence, health is a state of mental and physical well-being of the body.