List any four essential factors that must be taken care of by an individual for keeping good health.

(N/A) To maintain good health,an individual must focus on the following four essential factors:
$(i)$ Balanced diet: Consuming a diet that provides all necessary nutrients in the correct proportions is essential for the proper functioning of the body.
$(ii)$ Disease-free environment: Living in a clean environment free from pathogens and vectors is crucial to prevent the spread of infectious diseases.
$(iii)$ Proper sanitation: Maintaining personal and public hygiene,including clean water supply and proper waste disposal,helps in preventing the growth of disease-causing organisms.
$(iv)$ Mental and social stability: Good health is not just the absence of disease but a state of complete physical,mental,and social well-being. Maintaining positive social relationships and mental peace is vital for overall health.