Boyd Hope K, Kass Andrea E, Accurso Erin C, Goldschmidt Andrea B, Wildes Jennifer E, Le Grange Daniel
Department of Psychiatry and Behavioral Neuroscience, The University of Chicago, Chicago, Illinois.
Department of Psychiatry, UCSF Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, California.
Int J Eat Disord. 2017 Aug;50(8):963-969. doi: 10.1002/eat.22720. Epub 2017 Apr 21.
Individuals with eating disorders (ED), particularly anorexia nervosa (AN), and bulimia nervosa (BN), often wish to reduce their body weight in pursuit of a thin ideal, but no study has examined the relation between desired weight and ED pathology in a clinical population of youth. Given the potential impact of desired weight on normalization of eating patterns and weight restoration, we examined the relation between desired weight and ED pathology in youth with AN or BN.
Participants were 340 youth presenting to an outpatient ED clinical research program. Height and weight were measured, and youth completed the Eating Disorder Examination. Desired weight was operationalized as "desired weight percentage" (calculated as a percentage of expected body weight [EBW]) and "weight difference percentage" (actual weight minus desired weight, divided by actual weight and multiplied by 100).
Youth with AN desired to be a lower percentage of their EBW than youth with BN (p < .001). However, youth with AN, on average, wanted to gain 5.28% of their body weight and youth with BN wanted to lose 13.60% (p < .001). Desired weight percentage and weight difference percentage were associated with greater ED psychopathology, controlling for ED diagnosis, age, and sex (ps < .001).
Desired weight is associated with elevated ED psychopathology. Weight goals may shift as individuals progress through treatment; if they do not, then desired weight may be an important indicator of a lack of psychological progress.
患有饮食失调症（ED）的个体，尤其是神经性厌食症（AN）和神经性贪食症（BN）患者，常常希望减轻体重以追求瘦的理想状态，但尚无研究在青少年临床人群中考察期望体重与饮食失调症病理之间的关系。鉴于期望体重对饮食模式正常化和体重恢复的潜在影响，我们考察了患有AN或BN的青少年中期望体重与饮食失调症病理之间的关系。
参与者为340名到门诊饮食失调症临床研究项目就诊的青少年。测量身高和体重，青少年完成饮食失调症检查。期望体重通过“期望体重百分比”（计算为预期体重[EBW]的百分比）和“体重差异百分比”（实际体重减去期望体重，除以实际体重再乘以100）来操作化。
患有AN的青少年期望达到的EBW百分比低于患有BN的青少年（p <.001）。然而，患有AN的青少年平均希望体重增加5.28%，而患有BN的青少年希望体重减轻13.60%（p <.001）。在控制饮食失调症诊断、年龄和性别后，期望体重百分比和体重差异百分比与更严重的饮食失调症心理病理学相关（p <.001）。
期望体重与饮食失调症心理病理学升高相关。随着个体在治疗过程中的进展，体重目标可能会改变；如果没有改变，那么期望体重可能是心理进展不足的一个重要指标。
