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Psychotic Phenomena in Binge Eating Disorder: an Exploratory MMPI-2 Study

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Psychotic Phenomena in Binge Eating Disorder: an Exploratory MMPI-2 Study Archives of Psychiatry and Psychotherapy, 2015; 2: 13–20 DOI: 10.12740/APP/43321 Psychotic phenomena in Binge Eating Disorder: an exploratory MMPI-2 study Massimiliano Aragona, Anna Maria Petta, Andrea Balbi Summary Aim of the study. To study putative psychotic phenomena in patients with Binge Eating Disorder (BED). Subject or material and methods: Sixty patients with a DSM-5 diagnosis of BED were studied. Scores at the Sc, Pa and other subscales of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) were used to assess possible psychotic features. Eating phenomena were assessed by the Eating Disorder Inven- tory-2 (EDI-2). The relationship between them was studied. Results. Mean BMI was 38.24±8.43. The Sc and Pa scales of the MMPI-2 were above the cut-off in, re- spectively, 43.33% and 46.67% of patients. Regression analyses show that both Sc and Pa had a signif- icant effect on EDI-2 scores, although only the Sc scale remained significant after adjusting for their pos- sible interrelation. More than 40% of patients reported high scores (65 or more) at the following MMPI-2 “psychotic” subscales: Paranoia (Pa), Schizophrenia (Sc), Social Alienation (Sc1), Emotional Alienation (Sc2), and Lack of Ego Mastery, both cognitive and conative (Sc3 & Sc4). Perfectionism, Impulse Regu- lation, Ascetism, Social Insecurity, Interoceptive Awareness, Ineffectiveness, and Maturity Fears are the EDI-2 scales significantly influenced by the Sc and Pa MMPI-2 scores. Discussion. Several putative psychotic phenomena were reported in our sample of binge eaters, and they were related to higher scores on several dimensions of the EDI-2. Conclusions. At least in some patients, there might be an overlap between some psychotic basic phe- nomena (disordered sense of basic Self, of bodily experiences, and hyperreflectivity), and those basic dis- turbances in identity development and Self-schemas which are at the base of eating disorders. schizofrenia / phenomenology / psychosis / eiting disorders / binginng INTRODUCTION [1], the relationship between psychotic symp- toms and eating disorders has remained large- Although early classical psychopathological ly understudied for years [2]. More recent sur- reports on eating disordered phenomena con- veys have shown that schizophrenia, paranoia ceived them as part of a psychotic way of being and related features are not so rare in anorectic and bulimic patients [3]. Less evidence is avail- able for those eating disorders that were more Massimiliano Aragona1, Anna Maria Petta2, Andrea Balbi3: Clinical recently included in the DSM-5 [4], such as the Director of the Day Hospitalization Service for Eating Disorders “Villa Binge Eating Disorder (BED). The DSM-IV had Armonia Nuova”, ASL RMD, Rome (Italy); 2Crossing Dialogues Asso- ciation, Rome (Italy); 3Director of the Mental Health Department, ASL included BED in Appendix B among the puta- RMD, Rome (Italy). E-mail: [email protected]. tive disorders that needed more extensive study before inclusion in the official list of mental dis- Acknowledgments: The authors would like to thank the sanitary orders [5]. The DSM-5 recognized BED as an of- and administrative staff of the Villa Armonia Nuova Hospital (Rome, ficial disorder, describing it as the presence of re- Italy) for their important help. current and distressful episodes of binge eating, 14 Massimiliano Aragona et al. at least once a week for 3 months. An episode of (EDI-2) eating disorder-related phenomena in a binge eating is characterized by two criteria: a) group of patients with BED. eating , in a discrete period of time (e.g., with- in any 2-hour period), an amount of food that is definitely larger than what most people would MateriaLS AND METHODS eat in a similar period of time under similar cir- cumstances; and b) a sense of lack of control over Sample eating during the episode (e.g., a feeling that one All consecutive patients referring to a Day cannot stop eating or control what or how much Hospitalization Service specifically dedicat- one is eating). In DSM-5 such binge-eating ep- ed to Eating Disorders were asked to enter the isodes have to be associated with at least three study, to be clinically interviewed by both a psy- of the following features: a) eating much more chiatrist and a medical doctor specialized in nu- rapidly than normal; b) eating until feeling un- tritional issues, and to fulfil assessment instru- comfortably full; c) eating large amounts of food ments. All patients accepted and signed an in- when not feeling physically hungry; d) eating formed consent. Only those patients having a alone because of feeling embarrassed by how DSM-5 diagnosis of Binge Eating Disorder (BED) much one is eating; e) feeling disgusted with were included in the present study. oneself, depressed, or very guilty afterward. Fi- nally, the differential diagnosis between BED and bulimia nervosa is based on the lack of com- Assessment instruments pensatory behaviours in the former [6]. A recent PubMed Search (October, 30th, 2014) Body Mass Index (BMI) was computed at ad- found one study directly comparing obese fe- mission, in the same session including the psy- males with and without BED (7). It was shown chopathological and the psychodiagnostic eval- that BED patients had a more severe psycho- uations. Main socio-demographic variables were pathological profile than obese controls, in- recorded in a chart. Eating disordered behav- cluding higher SCL-90 interpersonal sensitiv- iours and other phenomena related to eating dis- ity (roughly corresponding to ideas of refer- orders were formally assessed by means of the ence), paranoid ideas, and psychoticism. More- Eating Disorder Inventory, 2nd Version (EDI-2), a over, such features were related to BED severity 91 items self-evaluated questionnaire specifical- (assessed with the Binge Eating Scale) [7]. Such ly designed and validated for Eating Disorders findings might be particularly relevant, because and widely used in previous research on these the co-occurrence of psychiatric disorders (such patients [9]. Patients have to evaluate how much as mood and psychotic disorders) and BED or often they had the described phenomenon. Items obesity has important public health and treat- are rated on a six-point scale, item responses be- ment implications, including the fact that the ing weighted as 0 (never, sometimes or rarely), treatment of BED and obesity co-occurring with 1 (often), 2 (usually), or 3 (always). It is possible psychopathology may be different from obesity to obtain a total EDI-2 score (a general measure without associated psychopathology [8]. of severity) and 11 subscales: Drive for Thinness Considering the rarity of studies systematical- (DT), Bulimia (B), Body Dissatisfaction (BD), In- ly addressing the relationship between BED and effectiveness (I), Perfectionism (P), Interpersonal possible psychotic phenomena, more research is Distrust (ID), Interoceptive Awareness (IA), Ma- needed on this topic, assessing possible psychot- turity Fears (MF), Ascetism (A), Impulse Regula- ic phenomena by means of different psychodi- tion (IR), and Social Insecurity (SI). Any dimen- agnostic instruments and correlating psychotic sional subscale is computed by summing item scores with dysfunctional areas which are typi- scores. cally related to eating disorders. The Minnesota Multiphasic Personality Inven- This study explores the relationship between tory-2 [10] has been used extensively to assess putative psychotic phenomena assessed with individuals with eating disorders [11]. It is a 567- the Minnesota Multiphasic Personality Invento- item self-report questionnaire in which respond- ry-2 (MMPI-2), and Eating Disorder Inventory-2 ents are asked to indicate whether each state- Archives of Psychiatry and Psychotherapy, 2015; 2: 13–20 Psychotic phenomena in Binge Eatinge Disorder 15 ment is generally true or false for them. The 567 patients included in the final statistical analysis items are computed to derive 3 validity indices were compared to patients that had not complet- (scales L, F, and K) and 10 clinical scales: Hypo- ed the assessment measures by means of Stu- chondriasis (Hs), Depression (D), Hysteria (Hy), dent’s T test or Chi Square Test. Psychopathic Deviation (Pd), Masculinity-Fem- In the study sample mean and standard de- ininity (M/F), Paranoia (Pa), Psychasthenia (Pt), viation values were computed for MMPI-2 and Schizophrenia (Sc), Hypomania (Ma), and Social EDI-2 scales. The number of patients with BED Introversion (SI). Raw scores on each scale are above the threshold scores of the MMPI-2 scales converted to T scores and values 65 and great- considered for psychotic phenomena were com- er are considered clinically significant [12]. In puted. Differences in EDI-2 scores between pa- this study, we focus our analysis on the Sc and tients scoring above and below the threshold for Pa scales of the MMPI-2. Although possible psy- the MMPI-2 Sc and Pa scales were compared by chotic phenomena are also included within oth- means of Student’s T test. er MMPI-2 scales (e.g. Ma and Pt scales), we de- Linear regression models were used to test the cided to focus only on those scales (Sc and Pa) influence of Sc and Pa on EDI-2 total scores. In where the likelihood of detecting possible psy- a second step a multiple linear regression mod- chotic phenomena is maximized. Indeed, se- el was used in order to consider the reciprocal vere mania and melancholic depression often influence of Sc and Pa as covariate independent present with psychotic features, but from a psy- variables on EDI-2 dimensions. chopathological point of view they were consid- ered by Jaspers as secondary phenomena arising from the basal disturbance of mood. As a con- RESULTS sequence, inclusion of bipolar symptoms was at risk of excessively decreased specificity of stud- Seventy-seven patients fulfilled DSM-5 crite- ied phenomena. For similar reasons we exclud- ria for BED and were included in the study.
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