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A sample of 112 twins [<jats:italic>n<\/jats:italic>\u2009=\u200951 met lifetime DSM\u2010IV ED criteria (anorexia nervosa <jats:italic>n<\/jats:italic>\u2009=\u200926; bulimic disorders <jats:italic>n<\/jats:italic>\u2009=\u200924), <jats:italic>n<\/jats:italic>\u2009=\u200919 unaffected cotwins and <jats:italic>n<\/jats:italic>\u2009=\u200942 control twins] was administered measures assessing reward reactivity, including the Game of Dice Task, the Behavioural Inhibition\/Activation (BIS\/BAS) Scales and the Appetitive Motivation Scale (AMS). Within pair, correlations for monozygotic and dizygotic twins were calculated and generalised estimating equations compared probands with non\u2010ED cotwins and controls. The BAS and the AMS were reduced in EDs and negatively associated with restrictive symptoms. In addition, monozygotic twins pairs demonstrated significant within pair similarity for the BAS and AMS. 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