Well-being is a broad, complex phenomenon, that can be defined as “peoples’ positive evaluations of their lives” [1]. In 1948, well-being was incorporated into the broad definition of health that encompassed “complete physical, mental, and social well-being” [2]. Recently, well-being has received increasing attention from epidemiologists, economists, psychologists, behavioral and social scientists, philosophers, policy makers, and has even become a part of public policy discourse [3, 4, 5, 6, 7].

Subjective well-being consists of two main components: cognitive and affective [8]. The cognitive element is related to evaluation and judgment of people of their own lives including aspects such as work satisfaction, and life satisfaction; that is, specifically chosen criteria assessing the quality of life of persons [3]. The affective dimension deals with moods, feelings, and emotions [9]. The latter dimension entails two main elements: positive emotions like happiness, affection, joy, giving rise to pleasant feelings and a positive mood; and negative emotions like sadness, anger, stress, which are responsible for negative mood, and unpleasant feelings [6, 10].