Health and happiness go hand in hand. You will be happy when you are healthy and health comes when there is happiness. This looks very simple to read but is very deep to understand and to practice. Health and happiness are not physical or mental alone but a combination of physical, mental, spiritual and social well being.
Physical health is by healthy eating, healthy activities, good body care, healthy sleeping habits and so on. Mental health is by positive and good thinking. Spiritual health is by awareness of 'self' and by following the path of righteousness. Social health is by healthy relationships and good conduct.