For example, pessimism and negative attitudes impact negatively one's mental health, can induce suicidal thoughts, and affect negatively not only the person in question, but also their family and friends (Peterson and Bossio, 2001;Achat et al., 2000;Scheier et al., 2001).
optimism reduces stress and promotes better physical health and overall well-being (Carver et al., 2010).