This review paper explores the relationship between optimism, personality, and well-being in individuals who follow a healthy lifestyle and those who do not. Along with defining optimism, personality and their importance in promoting well-being. It also reviews the existing literature on the differences in optimism and personality traits between individuals who follow a healthy lifestyle and those who do not. This research concludes that individuals who follow a healthy lifestyle tend to exhibit higher levels of optimism and certain personality traits, such as conscientiousness and openness, compared to those who do not. These findings have important implications for promoting well-being and may inform interventions aimed at improving mental health outcomes in individuals who are not following a healthy lifestyle. Further research is needed to better understand the mechanisms underlying the relationship between optimism, personality, and well-being, and to determine the most effective interventions for promoting well-being in different populations.