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The relationships among psychiatric medications, eating behaviors, and weight Davison, Karen M. 2013

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrightsAuthor's personal copy The relationships among psychiatric medications, eating behaviors, and weight Karen M. Davison  Department of Community Health Sciences, Faculty of Medicine, University of Calgary, Canada a b s t r a c ta r t i c l e i n f o Article history: Received 8 July 2012 Received in revised form 21 November 2012 Accepted 15 January 2013 Available online 9 February 2013 Keywords: Psychiatric medications Eating behaviors Eating attitudes Cognitive dietary restraint Disinhibition Weight To help address gaps in information about the links that exist between psychiatric medications and weight changes, an investigation of relationships among select psychotropic agents (i.e., mood stabilizers, antide- pressants, and second-generation antipsychotics {SGAs}), eating behaviors, and weight was conducted. Data from a cross-sectional study of food habits in 97 individuals with mood disorders was used. Variables measured included use of psychotropic agents, measures of cognitive dietary restraint and disinhibition from the Three Factor Eating Behavior Questionnaire (TFEQ), psychiatric functioning, reported weight gain and measured BMI. The TFEQ measures were compared to population norms. Bivariate and multivari- ate analyses examined the relationships among the psychotropic agents, eating behaviors, and weight. In- dicators of cognitive dietary restraint and disinhibition were higher than population norms (p'sb0.05 to 0.0001). Depression was associated with restraint (rho=0.21, pb0.05). BMI was associated with disinhibi- tion (pb0.05); antidepressant use appeared to moderate weight for those taking SGAs andmood stabilizers (pb0.05). Exploration of the interacting mechanisms of psychotropic agents and attention to eating atti- tudes and behaviors of individuals taking psychiatric medications might lessen pharmaceutical-induced weight gain. Prospective research on large samples that can make comparisons to those who are untreated is needed. ' 2013 Elsevier Ltd. All rights reserved. 1. Introduction Weight gain is often associated with the use of mood stabilizers, an- tipsychotics, and antidepressants (Allison et al., 1999; Parsons et al., 2009; Vanina et al., 2002) which can lead to issues such as metabolic syndrome, cardiovascular disease, medication non-compliance, and re- lapse risk (Archie et al., 2007). The weight gain experienced while tak- ing psychiatric medications may be due to hyperphagia from lack of satiation (Costa et al., 2001), altered energy homeostasis, and/or endo- crine disturbances (Esen-Danaci, Sarandol, Taneli, Yurtsever, & Ozlen, 2008). Dietary restraint, the intention to restrict food intake to control body weight, and disinhibition or the tendency to overeat in the pres- ence of disinhibiting stimuli (e.g., palatable foods, emotional stress) (Stunkard & Messick, 1988), have been implicated as determinants of weight gain. Dietary disinhibition is positively associated with weight (Hainer et al., 2006; Hays et al., 2002; Lindroos et al., 1997), but the association between dietary restraint and weight remains unclear (Hainer et al., 2006; Hays et al., 2002; Lauzon-Guillain et al., 2006; Lowe et al., 2006) possibly due to interaction effects of restraint and disinhibition (Foster et al., 1998; Hays et al., 2002; Lawson et al., 1995; Williamson et al., 1995). There has been little investigation of relationships that may exist among the use of psychiatric medications, dietary restraint, disinhibi- tion, and weight. One study reported higher dietary restraint scores in 29 people with schizophrenia who were treated with second gen- eration antipsychotics (SGAs) compared with controls, and found that dietary restraint, as measured by the Three-Factor Eating Ques- tionnaire (TFEQ), correlated positively with disinhibition and BMI (Knolle-Veentjer, Huth, Ferstl, Aldenhoff, & Hinze-Selch, 2008). An- other study examined the TFEQ and the Dutch Eating Behavior Questionnaire (DEBQ) in 93 individuals treated with SGAs, 27 treated with conventional neuroleptics and 33 untreated patients (Sentissi et al., 2009) and found that mean BMI varied signicantly among the three groups: DEBQ external eating factor was signi- cantly higher in people treated with SGAs compared to conven- tional neuroleptics (Sentissi et al., 2009). The TFEQ disinhibition (p=0.003) and hunger scores (p=0.017) increased according to BMI. Investigation of motivators of eating, weight status and the use of different psychiatric medications could help further the understanding of mechanisms of weight gain that often occurs with these drugs. In a study that characterized food intakes of adults with mood disorders, signicantly higher intakes of fatty, Eating Behaviors 14 (2013) 187–191  Chronic Condition SelfManagement, University of British Columbia, School of Population and Public Health, Canada. E-mail address: kdavison@vivahealthed.com. 1471-0153/$ – see front matter ' 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.eatbeh.2013.01.001 Contents lists available at SciVerse ScienceDirect Eating BehaviorsAuthor's personal copy sugary, and salty foods were found when compared to population norms (Davison & Kaplan, 2012a, 2012b). Part of this research in- cluded collecting data on types of psychiatric medications, dietary restraint, disinhibition, and weight which enabled analysis of the relationships among these variables. 2. Materials and methods 2.1. Sample The sample was drawn from a survey on food habits and has been detailed elsewhere (Davison & Kaplan, 2012a, 2012b). The study's protocol was approved by the University of Calgary's Conjoint Health Research Ethics Board. A clinical interviewer administered the Struc- tured Clinical Interview for DSM-IV Axis I Disorders (SCID) (First, Spitzer, Gibbon, & Williams, 2001), Global Assessment of Functioning (GAF) scale (Jones, Thornicroft, Coffey, & Dunn, 1995), Hamilton De- pression (Ham-D) scale (Hamilton, 1960), and Young Mania Rating Scale (YMRS) (Young, Biggs, Zieler, & Meyer, 1978). 2.2. Eating behavior and weight measurements A trained registered dietitian asked questions from the TFEQ (Stunkard & Messick, 1985). To allow for direct comparisons to the British Columbia Nutrition Survey (BCNS) or regional “population norms” (British Columbia Ministry of Health Services, 2004), ve items from the restraint subscale and four items from the disinhibi- tion subscale with the highest item-total correlations to each of the subscale scores were selected for inclusion. Other data collected in- cluded age of onset of psychiatric condition, types of medications taken, reported weight changes after starting psychiatric medication, as well as sociodemographic, weight, and height information based on standard protocols (British Columbia Ministry of Health Services, 2004). 2.3. Data analysis Descriptive analyses included using binomial tests of two propor- tions, as well as parametric and non-parametric statistics where ap- plicable. Three multiple regression models were used to examine the relationships among selected sociodemographic and clinical vari- ables, restraint, disinhibition, and BMI. The data were analyzed using the statistical software program Stata 7.0 (Stata Corporation, 2002). 3. Results 3.1. Sample The response rate was 75% and there were no signicant differ- ences between the respondents (n=97) and those who declined par- ticipation and completed a non-response survey (n=11) based on a variety of health behaviors such as smoking and multivitamin use. The sample would be described as being mainly females (n=69; 71.1%) with bipolar disorder (59.8%), taking psychiatric medication (87.6%), and having BMIs exceeding 25 (n=65; 67%). Their educa- tional attainment levels tended to be less than a bachelor's degree (n=76; 78.4%) and they had government-dened low income levels (n=47; 48.5%). Psychological data suggested that the sample was generally high functioning; GAF (62.7±14.7), YMRS (Median=3; IQR=1, 5) and Ham-D scores (Median=9.6, IQR=1, 31). For those taking mood stabilizers, there was a higher proportion of the sample (35%) who carried excess weight (BMI>25) when compared to the use of SGAs (18%) and antidepressants (31%) (pb0.05). 3.2. Restraint and disinhibition: prevalence estimates and sociodemographic differences The proportion answering yes to individual cognitive dietary re- straint and disinhibition questions was higher than population norms (p'sb0.05 to 0.0001), however, only the overall mean disinhi- bition scores were signicantly higher than the BCNS (Table 1). Gen- erally, women were more likely than men to agree with statements reecting cognitive dietary restraint or disinhibition (range of pb0.05 tob0.0001). However, more males tended to restrict their food intake in a conscious effort to control weight (pb0.05) or were more likely to go on eating binges (pb0.0001). Disinhibition scores negatively correlated with age (rho=−0.28, pb0.05) and there was a positive correlation between restraint scores and income (pb0.05). Those who answered afrmatively to the statement “I do not eat some foods because they make me fat” tended to have higher education (pb0.05). 3.3. Relationships among restraint, disinhibition, and BMI Ham-D and restraint scores were positively correlated (rho=0.21, pb0.05). Higher BMI was associated with disinhibition (pb0.05). There tended to be a higher proportion who reported weight changes since starting their psychiatric medications and agreed with dietary restraint and disinhibition statements (p'sb0.05 to 0.0001). The use of mood sta- bilizerswas associatedwith excessweight (pb0.05) (Table 1). Disinhibi- tion andBMIwere signicantly associatedwith interactive effects among selectmedications (Fig. 1). Antidepressants appeared tomoderate the ef- fects of SGAs and mood stabilizers on BMI (p'sb0.05). Interaction was also found between SGAs andmood stabilizers in relationship to disinhi- bition scores (pb0.05). 4. Discussion In this study, dietary restraint and disinhibition were signi- cantly more prevalent than population norms and were associated with weight gain. While disinhibition was positively correlated with BMI, restraint was associated with depression. Antidepressant use was associated with components of disinhibition and moderat- ed relationships between BMI, SGAs and mood stabilizers. Disinhi- bition was associated with the interaction of SGAs and mood stabilizers. The results support different theories about cognitive dietary restraint, disinhibition and weight. The nding that a lower pro- portion of individuals reported weight gain when some dietary re- straint was present support the hypotheses that cognitive dietary restraint contributes to weight suppression (Barr & Rideout, 2009) and may help with weight management. Conversely, high dietary restraint may have serious implications as it can create psychological stress that activates the hypothalamic-pituitary-adrenal axis, increases release of cortisol (Miller & O'Callaghan, 2002), and affects mood stability (McEwen & Stellar, 1993). Prospective investigations could determine if depression can be attributed to altered nutrition and metabolic functions or if the psychological effects of restraint, separate from biochemical changes due to diet, affect psychiatric symptoms; it is likely the relationships be- tween food restriction and negative mood state are interactive. Fi- nally, the correlation between BMI and disinhibition scores may lend support to theories regarding the relationships among the neurotransmitters serotonin and histamine with control of appe- tite (Blouin et al., 2008). Some of the ndings of this study were unexpected and should be interpreted with caution. It was surprising that only mood stabilizers were associated with excess weight and that there were signicant interactions among antidepressants, SGAs and mood stabilizers with BMI. While the exact mechanisms of action for antidepressants, 188 K.M. Davison / Eating Behaviors 14 (2013) 187–191Author's personal copy SGAs and mood stabilizers are relatively unknown, the results sug- gest that certain combinations moderate eating and weight. How- ever, this small, hypothesis-generating, cross-sectional study that did not include measures of hunger and dieting behavior, which could help account for effects of eating behavior and weight (Savage, Hoffman, & Birch, 2009), presents ndings that are speculative. The main results suggest that associations exist among restraint, disinhibition, weight, and psychiatric medication use and that antide- pressants combined with SGAs or mood stabilizers may moderate BMI. Exploration of the interacting mechanisms of antidepressants, SGAs, and mood stabilizers and attention to eating attitudes and be- haviors of individuals taking psychiatric medications might lessen pharmaceutical-induced weight gain. However, prospective studies using larger samples and comparisons to those who are untreated are needed. Role of funding source The Danone Research Institute provided nancial support for the conduct of this research project. The funder did not have any role in study design, collection, analysis, Table 1 Agreement with statements about eating restraint and dietary disinhibition with comparison to the BCNS and by type of mood disorder, psychiatric medication and BMI status. Statements reecting cognitive dietary restrainta Study, {BCNS}b n (%) Type of medication (%)c BMI Weight gain (%) (n=40)SGA d (n=26) ADe (n=44) MSf (n=46) Mean±SD ≥25 (%) (n=61) I do not eat some foods because they make me fat 53 {40} 84.6 77.3 67.4 28.3±5.5 70.5 67.5 I deliberately take small helpings as a means of controlling my weight 51 {29} 69.2 68.2 69.6 28.8±6.0 75.4 77.5 How often are you restricting your food intake in a conscious effort to control your weight? Rarely 28 {51} 7.7 20.5 21.7 29.5±7.9 21.3 17.5 Sometimes 31 {29} 38.5 36.4 23.9 28.6±6.9 32.8 35.0 Usually 28 {15} 34.6 31.8 32.6 27.7±3.8 26.2 30.0 Always 13 {6} 19.2 6.8 13.0 31.6±5.3 16.4 12.5 How likely are you to consciously eat less than you want? Unlikely 29 {54} 34.6 29.5 26.1 29.4±6.5 32.8 35.0 Slightly likely 18 {25} 19.2 15.9 19.6 29.9±6.5 20.0 25.0 Moderately 31 {16} 23.1 36.4 26.1 28.2±7.2 29.5 22.5 Very likely 19 {5} 15.4 15.9 23.9 26.0±3.6 16.4 15.0 How would you rate your restraint? Eat whatever you want, whenever you want 1.0 {22.2} 1.0 0.0 0.0 – – – Usually eat whatever you want, whenever you want 18.6 {24.2} 5.0 8.0 8.0 32.2±6.9 24.6 35.0 g Often eat whatever you want, whenever you want 17.5 {21.4} 2.0 10.0 5.0 27.6±5.1 19.7 7.5h Often limit food intake, but often ‘give in’ 33.0 {20.7} 11.0 15.0 22.0 28.1±4.9 36.1 25.0 Usually limit food intake, rarely ‘give in’ 18.6 {10.6} 6.0 9.0 6.0 28.2±8.2 16.4 25.0 Constantly limit food intake, never ‘give in’ 7.2 {0.9} 1.0 1.0 4.0 24.3±3.1 4.9 7.5 Restraint scoresi 1.4±0.7 {1.3±1.3} 1.5±0.6 1.5±0.7 1.4±0.7 0.04 1.4±0.6 1.5±0.7 Statements reecting disinhibitiona Study, {BCNS}b n (%) Type of medication (%)c BMI Weight gain (%) (n=40)SGAd (n=26) ADe (n=44) MSf (n=46) Mean±SD ≥25 (%) (n=61) When I feel ‘down’ or sad, I often overeat 46 {20} 73.1 72.7 73.9 29.1±5.5 73.8 77.5 Sometimes when I start eating, I just can't seem to stop 51 {22} 61.5 61.4 67.4 29.9±6.6 67.2 62.5 When I feel lonely, I console myself by eating 51 {13} 69.2 72.7 63.0 29.5±6.5 65.6 62.5 Do you go on eating bingesj even though you are not hungry? Never 35 {76} 26.9 50.0 26.1 28.0±7.8 31.1 13 Rarely 14 {14} 7.7 26.9 13.0 27.1±5.1 11.5 5 Sometimes 36 {8} 53.8 61.5 50.0 29.4±4.7 39.3 12 At least weekly 15 {1} 11.5 23.1 4.3 29.6±7.9 11.5 6 Mean±SD rho Mean±SD Disinhibition scoresk 1.9±1.2 {0.5±1.0} 2.0±1.3 2.1±1.1 2.0±1.1 0.26 2.0±1.1 2.0±1.1 Signicant differences between study sample and BCNS at: pb0.05, pb0.001 or pb0.0001. a Questions from Stunkard and Messick (1985). b Sample size for study=97; sample size for BCNS=1823. c Statistical comparisons of medication groups based on logistic regression analysis. d Second-generation antipsychotics included dibenzodiazepine, benzisoxazole, thienobenzodiazepine, indolone, and quetiapine (clozapine, risperidone, olanzapine, molindone, seroquel). e Anti-depressant medications included the tricyclics, atypicals, selective serotonin reuptake inhibitors, serotonin and norepinephrine reuptake inhibitors, monoamine oxidase inhibitors, noradrenergics, and specic serotonergics. f Mood stabilizers included carbamazepine, lithium carbonate, divalproex sodium and valproic acid. g Proportion reporting weight gain signicantly higher for this response. h Proportion reporting weight gain signicantly lower for this response. i Restraint scores reect the perception that food intake is consciously limited in an attempt to control body weight. Scores are based on ve items taken from the restraint subscale of the Three-Factor Eating Questionnaire (Stunkard & Messick, 1985). j Binge eating means eating a very large amount of food in a very short period of time, and feeling that you can't control how much you're eating. k Disinhibition scores reect the perception that control over food intake can be lost in response to certain situations, leading to overeating. Scores are based on four items taken from the disinhibition subscale of the Three-Factor Eating Questionnaire (Stunkard & Messick, 1985). 189K.M. Davison / Eating Behaviors 14 (2013) 187–191Author's personal copy or interpretation of data, writing the manuscript, or the decision to submit the man- uscript for publication. Contributors This work is based on the author's doctoral work at the Department of Community Health Sciences, Faculty of Medicine, University of Calgary, Calgary, Alberta. Conict of interest The author has no conicts of interest to declare. Acknowledgements Thank you to Dr. Bonnie J. Kaplan for her insights on the development of the man- uscript. Gratitude is also extended to the funding source for this study, the Danone Re- search Institute and the Mood Disorders Association of British Columbia for providing support staff, ofce space and assistance with the recruitment. References Allison, D. B., Mentore, J. L., Heo, M., Chandler, L. P., Cappelleri, J. C., Infante, M. C., et al. (1999). Antipsychotic-induced weight gain: A comprehensive research synthesis. The American Journal of Psychiatry, 156, 1686–1696. Archie, S. M., Goldberg, J. O., Akhtar-Danesh, N., Landeen, J., McColl, L., & McNiven, J. (2007). Psychotic disorders, eating habits, and physical activity: Who is ready for lifestyle changes? Psychiatric Services, 58, 233–239. Barr, S. I., & Rideout, C. A. (2009). “Restrained eating” vs “trying to lose weight”: How are they associated with body weight and tendency to overeat among postmenopausal women? 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