Delay discounting measures one's preference for smaller-sooner versus larger-later reward and is a facet of impulsivity. Studying delay discounting in bulimia nervosa (BN) may enhance clinical understanding of BN, as BN is characterized by engagement in behaviors that provide immediate reward (i.e., binge eating, purging) at the expense of future well-being. Prior research suggests that individuals with BN prefer smaller amounts of money available sooner compared to psychiatrically healthy (HC) persons. Here, we aimed to replicate and extend previous work by studying delay discounting of both monetary and food reward in women with BN relative to HC women. We also compared delay discounting of monetary and food reward, and examined associations among delay discounting, trait impulsivity, and eating disorder symptom expression in women with BN. Participants were 20 women with sub- or full-threshold DSM-5 BN and 20 HC women who completed a diagnostic interview, paper-and-pencil measures of delay discounting of monetary and food commodities, and a measure of trait impulsivity. Contrary to previous work, we found that women with BN showed decreased delay discounting of monetary and food reward relative to HC women. Within-group analyses demonstrated that women with BN showed elevated delay discounting of food reward relative to monetary reward. Within women with BN, elevated delay discounting of food, but not money, was associated with elevated negative and positive urgency, two facets of trait impulsivity that relate to acting rashly when experiencing strong emotion. Results suggest that delay discounting may be more variable in BN than previously assumed.

延迟贴现衡量的是一个人对较早较小奖励与较晚较大奖励的偏好，是冲动的一个方面。研究神经性贪食症 (BN) 的延迟折扣可能会增强对 BN 的临床理解，因为 BN 的特点是从事以牺牲未来福祉为代价的立即奖励行为（即暴饮暴食、净化）。先前的研究表明，与精神健康 (HC) 的人相比，患有 BN 的人更喜欢更快获得少量资金。在这里，我们的目的是通过研究 BN 女性相对于 HC 女性的金钱和食物奖励的延迟折扣来复制和扩展之前的工作。我们还比较了金钱和食物奖励的延迟折扣，并检查了 BN 女性的延迟折扣、特质冲动和饮食失调症状表达之间的关联。参与者包括 20 名DSM -5 BN低于或完全阈值的女性和 20 名 HC 女性，她们完成了诊断访谈、货币和食品商品延迟贴现的纸笔测量以及特质冲动测量。与之前的研究相反，我们发现，与HC 女性相比，BN 女性在金钱和食品奖励方面的延迟折扣有所减少。组内分析表明，与金钱奖励相比，患有 BN 的女性表现出食物奖励的延迟折扣较高。在患有 BN 的女性中，食物而非金钱的延迟折扣增加与消极和积极的紧迫感增加有关，这两个方面的冲动特质与经历强烈情绪时的鲁莽行为有关。结果表明，BN 中的延迟贴现可能比之前假设的变化更大。