Give any four factors necessary for a healthy person.
1. A clean physical environment with the help of public health services,
2. A congenial social environment.
2. Personal Hygiene. Personal cleanliness prevents catching up of infectious diseases.
3. Nourishment. A proper balanced diet keeps the immune system strong.
4. Vaccination. Timely vaccination against major diseases protects oneself from catching those diseases.
5. Avoiding overcrowded areas
6. Regular exercise and relaxation.