Abstract

BackgroundThe prevalence of obesity is rapidly increasing worldwide, together with its comorbidities. Our aim was to assess the emotional traits and affective temperaments, according to various Body Mass Index (BMI) groups, in a large sample. MethodsData was collected by a web-survey on psychological and psychiatric measures (BRAINSTEP). The BMI was evaluated by self-reporting and temperament was evaluated by the Affective and Emotional Composite Temperament Scale (AFECTS). The final sample consisted of 10,786 individuals (mean age 27.9±7.8 years, 70% females). ResultsAbout 40% of the sample had a BMI score higher than normal. The overall BMI score was particularly associated with a higher Desire and a lower Control and Volition (p<0.001 for all), especially in women. Obese females also had significantly lower Coping, Stability, and Caution. In males only, underweight individuals were more fearful and sensitive, and they had a lower Coping and Volition character than normal weight subjects, suggesting a more fragile and immature profile. Linear regression with several adjustments confirmed these associations. Regarding affective temperaments, a Depressive type was more prevalent among underweight subjects, an Obsessive type was associated with a normal BMI, and a Hyperthymic type was apparent in overweight individuals of both genders. Underweight males and females were more prone to having an internalized temperament. LimitationsOnly self-reporting measures were used in a cross-sectional design. ConclusionsObese women and underweight men have a more dysfunctional trait profile. Addressing these traits may be important for prevention strategies and, possibly, for weight reduction in women.

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