term goals like keeping a healthy body weight. Therefore, impulsive de- cision-making based on a strong preference for immediate gratification, might be a risk factor for overweight and obesity. Several studies using the Iowa Gambling Task (IGT) have shown that overweight adults and adolescents are more impulsive decision-makers than normal-weight subjects. However, hitherto no study has investigated at what age this weight-group difference develops. We assessed decision-making in 110 overweight and 110 normal-weight elementary school children (aged 6e11 at T1) using a longitudinal design (two time points: T1 and T2; approximately 3 years apart). Decision-making was measured using a child-appropriate version of the IGT. A block-wise analysis of the scores allowed us to examine learning within the task. Mixed-design ANOVA showed that at T2 (ages 9 e 14) overweight children made more impulsive decisions than normal-weight controls. Averaged over both time points, overweight children displayed less block-wise improvement within the task. However, including gender into the analysis revealed that the block x weight status interaction was significant for boys but not for girls. These results indicate that the weight-group difference in decision-making already emerges in middle childhood. Although we cannot conclude a causal direction from this study, we hypothesize that deficits in decision- making are a risk factor for overweight in elementary school aged boys. RELATIONSHIPS BETWEEN CHANGES IN PERCEIVED SOCIAL NORMS AND SELF-REPORTED FOOD INTAKE AMONG UNIVERSITY STUDENTS ACROSS AN ACADEMIC YEAR J. Liu 1 , J.M. Thomas 1 , E. Robinson 2 , S. Higgs 1 . 1 School of Psychology University of Birmingham, UK; 2 Department of Psychology, University of Liverpool, UK E-mail address: JXL387@student.bham.ac.uk (J. Liu). Perceptions of how other people behave provide a guide as to appropriate behaviour, such that one’s own eating behaviour may change to align with a perceived norm. However, whether perceived social norms are related to changes in intake over time remains unclear. The present study examined whether changes in the perceived intake of other students (social norm) predicted self-reported intake at 12 months. 669 undergraduate students (83% females, average age ¼ 19 years, average BMI ¼ 22.0) completed an online questionnaire asking about demographics, norm perceptions and eating habits at baseline. 274 of those students (89% females, average age ¼ 19 years, average BMI ¼ 22.0) completed a follow up assessment at 12 months (dropout rate 59%). All analyses included age, gender and baseline BMI as covariates. At baseline, perception of fruit and vegetable intake by other students was lower than self-reported intake and perception of the intake of junk food was higher then self-reported intake. Both self-reported baseline vegetable intake and change in norm percep- tion significantly predicted self-reported vegetable intake at 12 months. An increase in the perception of how many vegetables other students eat was associated with higher personal self-reported intake at 12 months. Similarly, changes in the perception of how much fruit and junk food other students eat and intake at baseline significantly predicted self-reported fruit, and junk food intake at 12 months. These data support the testing of healthy eating interventions targeted at correcting social norm percep- tions. AN EXAMINATION OF THE PSYCHOMETRIC CONSTRUCT OF ‘FOOD ADDICTION' AND ITS RELATIONSHIP WITH TRAIT BINGE EATING, ADDICTIVE PERSONALITY AND PSYCHOLOGICAL WELLBEING Cecilia Long, Graham Finlayson, John Blundell. School of Psychology, University of Leeds, UK E-mail address: C.G.Long11@leeds.ac.uk (C. Long). Some individuals ascribe others' intake of one or more frequently consumed foods as an ‘addiction’. Whilst the concept of ‘Food Addiction' (FA) is often used metaphorically to reflect loss of control over intake of certain foods, recently researchers have framed overconsumption and obesity relative to clinically-defined substance-use and addictive disor- ders. The present study used the Yale Food Addiction Scale (YFAS) to examine the strength of its associations with problematic eating, addictive behaviours and psychological wellbeing; and after controlling for the existing trait binge eating construct. Of participants completing the full online questionnaire (N ¼ 710), 8.5% (N ¼ 60) met the YFAS ‘diagnosis’ for FA. YFAS ‘diagnosis’ and ‘symptom count’ correlated significantly with scores on five eating behaviour questionnaires. However, correlations between the YFAS and measures of substance abuse and addictive per- sonality traits were inconsistent, signifying that the YFAS may not reflect an addiction-based trait, but simply loss of control over food intake. Regression analyses revealed that the addition of YFAS to Binge Eating Scale (BES) scores accounted for minimal additional variance in other measures, demonstrating that associations between the YFAS and mea- sures of problematic eating, addictive behaviours and psychological impairment can be adequately explained by the BES alone. To conclude, whilst the YFAS may identify a small proportion of the population reporting uncontrolled overconsumption of palatable foods, these in- dividuals do not appear to demonstrate an addictive disposition or behavioural differences compared to those identified by the BES. This study was supported by a grant from Sugar Nutrition UK. INTEROCEPTION IN ANOREXIA NERVOSA: EVIDENCE AT CORTICAL AND SELF-REPORT LEVELS Annika Lutz 1,* , Andr e Schulz 1 , Ulrich Voderholzer 2 , Stefan Koch 2 , Claus V€ ogele 1 . 1 University of Luxembourg, Institute for Health and Behaviour, MSH 11, porte des Sciences, L-4366 Esch-sur-Alzette Luxembourg; 2 Sch€ on Klinik Roseneck, Prien, Germany * Corresponding author. E-mail address: annika.lutz@uni.lu (A. Lutz). Anorexia nervosa (AN) is characterised by strict fasting and profound changes in body image. There is an ongoing discussion about the possible role of alterations in the perception and interpretation body signals (e.g. hunger, satiety, heartbeat) for the aetiology of AN. It remains unclear to what extent changes in visceral processes, alterations in the ability to perceive these processes, or differences in attention allocation and cognitive interpretation play a role. Heartbeat evoked brain potentials (HEP) appear contingent to the heartbeat and reflect the representation of cardiac afferent signals in the central nervous system (CNS). HEPs were assessed in 20 in-patients with AN and 20 healthy control persons during rest and during a heartbeat perception task (HPT). In this task participants were asked to perceive and count their own heartbeats. Individuals with AN had significantly larger HEP amplitudes than control persons. There was a tendency for patients with AN to perform better in the heartbeat perception task. HEP amplitudes were positively correlated with severity of eating disorder symptoms and duration of the current treatment for AN. This indicates enhanced CNS representation of interoceptive signals in AN. This effect cannot be explained by increased peripheral activation (e.g. heart rate, HRV). The results are discussed in terms of AN psychopathology and recovery resulting from in-patient treatment. Acknowledgements: This project was supported by the National Research Fund, Luxembourg (FNR). IMPLICIT AND EXPLICIT ATTITUDES TOWARDS FOOD IN NORMAL- AND OVER-WEIGHT FRENCH CHILDREN Lucile Marty, St ephanie Chambaron, Marie Bournez, Sophie Nicklaus, Sandrine Monnery-Patris. INRA UMR CSGA, 17 Rue Sully, BP86510, 21065 Dijon Cedex, France E-mail address: lucile.marty@dijon.inra.fr (L. Marty). In the food domain, attitudes reflect one’s acquired predisposition towards food and combine hedonic and nutritional components. Implicit attitudes are assumed to influence spontaneous behaviours, whereas explicit atti- tudes are assumed to influence deliberative behaviours. The aim of this study was to compare nutritional- versus hedonic-based attitudes towards food between normal- and over-weight children using both implicit and explicit tasks. Normal-weight (n ¼ 81; mean zBMI ¼ 0.06 ± 0.97) and overweight children (n ¼ 57; mean zBMI ¼ 3.5 ± 1.17) performed two tasks assessing attitudes on a touch-screen tablet: an implicit pairing task in which children had to choose the two food items that “go best together” Abstracts / Appetite 107 (2016) 677e694 687