AUTHOR=Burnos Agnieszka , Skrobowski Andrzej TITLE=Temperamental and Personality Traits as Factors Related to Changes in Health Behaviors and Quality of Life in Patients With Metabolic Syndrome in Poland JOURNAL=Frontiers in Psychology VOLUME=Volume 12 - 2021 YEAR=2021 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2021.709935 DOI=10.3389/fpsyg.2021.709935 ISSN=1664-1078 ABSTRACT=Lifestyle changes in diet and physical activity are necessary for managing metabolic syndrome. The aim of this longitudinal study was to examine temperamental and personality traits as moderators of lifestyle changes prompted by motivational intervention. The sample consisted of 50 patients aged 22–65 years (M = 45.26; SD = 9.79) who fulfilled the diagnostic criteria for metabolic syndrome and were undergoing treatment at the Military Institute of Medicine in Warsaw. There were two measurements: one initial measurement and a second 15 months after motivational counselling. Each patient completed the questionnaires: Formal Characteristics of Behavior – Temperament Inventory, NEO Five Factor Inventory, Inventory of Health Behavior, and Short Form Survey SF-36. Body Mass Index, Fat Mass, Fat-free Mass, Intracellular Water, and Basal Metabolic Rate were also measured. Data were analysed using dependent samples t-tests to detect changes in consecutive measurements; hierarchical regression analysis was used to investigate temperamental and personality traits as predictors of change; cluster analysis was used to extract subgroups of patients with distinct profiles of temperamental and personality traits; and analysis of variance was used to analyze extracted profiles as potential moderators of change. Three subgroups were extracted using k-means clustering: patients with higher Neuroticism, Perseveration, and Emotional Reactivity; patients higher Extraversion, Briskness, Sensory Sensitivity, Endurance, Activity, and Conscientiousness; and patients with lower Perseveration. All patients improved significantly in terms of physical quality of life, health behaviors, Body Mass Index, Basal Metabolic Rate, and Fat-Free Mass (p < .05). Regression analysis found that higher Sensory Sensitivity, lower Perseveration, and higher Agreeableness fostered positive change (p < .05). Patients with higher Neuroticism, Perseveration, and Emotional Reactivity also improved in terms of their Emotional Quality of Life and Health Practices, reaching parity with other patients, which was verified on the basis of statistically significant interaction (p < .05). The temperamental and personality trait profiles moderated changes in health practices and emotional quality of life. Motivational counselling was effective for patients diagnosed with metabolic syndrome in general, but patients with higher Neuroticism, Perseveration, and Emotional Reactivity benefited even more, as they were in poorer psychological condition before the motivational intervention.