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    The effects of individual circadian rhythm differences on insomnia, impulsivity, and food addiction
    (SPRINGER, 2019) Kandeger, Ali.; Selvi, Yavuz.; Tanyer, Deniz Kocoglu.
    Individuals can generally be divided into morning, neither and evening types according to behavioral, psychological, and biological variables including appetite levels, usual meal times, sleep times, and melatonin secretion. These factors together identify a person as being part of a certain chronotype, i.e., as feeling more efficient either in the morning (morning type) or later in the day (evening type). Food addiction is defined as addictive behavior toward palatable foods and is thought to be one of the underlying risk factors for obesity. Our aim in this study was to investigate the relationship between circadian rhythm differences and food addiction via insomnia and impulsivity in university students. Participants were 1323 university students, filled out a package of psychological tools, including the Morningness-Eveningness Questionnaire, Insomnia Severity Index, Barratt Impulsiveness Scale Short Form, and Yale Food Addiction Scale. Logistic regression analysis was used to investigate direct relation of food addiction with insomnia, impulsivity and obesity, and mediation regression analysis was used to investigate the indirect effect of circadian rhythm differences on food addiction. Our findings indicated that evening types were more prone to insomnia and impulsivity, and also insomnia and impulsivity significantly contributed to the variance of food addiction. Although there was no significant linear relationship between circadian rhythm differences and food addiction, evening-type circadian preferences were indirectly associated with higher food addiction scores mediated by insomnia and impulsivity. The most remarkable result of our work was that circadian rhythm differences seem to indirectly effect on food addiction through elevated insomnia and impulsivity. Level V, descriptive cross-sectional survey.
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    The relationship of consumers' compulsive buying behavior with biological rhythm, impulsivity, and fear of missing out
    (TAYLOR & FRANCIS LTD, 2019) Aydin, Duygu.; Selvi, Yavuz.; Kandeger, Ali.; Boysan, Murat
    In this study, we aimed to investigate the relationship between compulsive buying (CB), biological rhythm, impulsivity, and fear of missing out (FoMO). The data in the research was collected from 493 university students using a package of psychological tools including the personal questionnaire, the Compulsive Buying Scale (CBS), Barratt Impulsiveness Scale (BIS-11), Fear of Missing Out Scale (FoMOs), Morningness-Eveningness Questionnaire (MEQ), Sleep Hygiene Index (SHI), and Depression Anxiety Stress Scale-21 (DASS-21). One-way analysis of variance was used to investigate the differences in scales scores across chronotypes, and hierarchical regression analysis to understand the relationships of compulsive buying scores with socio-demographic characteristics and scales scores. Morning-typeindividuals reported lower scores on the CBS, impulsivity, FoMOs, anxiety, and stress than evening-types or neither-types. According to the hierarchical regression analyses, compulsive buyers reported significantly greater levels of impulsivity, depression, anxiety, and fear of missing out. The results showed that evening-type individuals were more likely to compulsive buying behaviors, impulsivity, and FoMO. In conclusion, this study revealed pioneering findings in terms of CB-related factors. It also showed the relationship between consumers' compulsive buying behavior, and FoMO and the effect of circadian preferences in biological rhythms on this relationship.