Differential effects of daily snack food intake on the reinforcing value of food in obese and nonobese women
Differential effects of daily snack food intake on the reinforcing value of food in obese and nonobese women
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DOI：
10.3945/ajcn.2008.27283
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发表时间：
2009-08-01
影响因子：
7.1
通讯作者：
Epstein, Leonard H.
中科院分区：
文献类型：
--
作者：
Temple, Jennifer L.;Bulkley, Alison M.;Epstein, Leonard H.
背景：食物强化，即获取食物的动机，与能量摄入和肥胖有关。找到减少不健康食物强化价值的方法可能有助于坚持饮食和保持减肥。我们之前在非肥胖成年人中的研究表明，每天食用相同的零食(餐外食物)14d，其强化值显著降低。目的：本研究的目的是将这些发现复制和推广到肥胖者，并考察不同份量的零食对食物强化的影响。设计：对31名肥胖者和27名非肥胖者在基线和每天摄入0、100或300大卡/天的相同零食2周后测试食物强化和喜好。结果：我们发现在操作者对食物的反应模式上，阶段、份量大小和体重指数存在显著的交互作用。肥胖女性在食用300卡路里的食物2周后，食物强化作用显著增加，而非肥胖女性的反应则相反。在0千卡和100千卡大小的条件下，增强值没有显著差异。在300千卡的女性(肥胖和非肥胖)中，报告称从基线到每天摄入后，女性对零食的喜好显著下降。结论：这些发现表明，肥胖和非肥胖女性对日常零食摄入量的反应不同，这可能不是减少肥胖女性食物强化的可行机制。这项试验在www.Clinicaltrials.gov上注册为NCT00837694。AM J Clin Nutr 2009；90：304-13。
Background: Food reinforcement, ie, motivation to obtain food, is associated with energy intake and obesity. Finding ways to decrease the reinforcing value of unhealthy foods may help with adherence to diets and maintenance of weight loss. Our previous study in nonobese adults showed that daily consumption of the same snack food (food consumed apart from meals) for 14 d significantly decreased its reinforcing value.Objectives: The aims of this study were to replicate and extend these findings to obese individuals and to examine the effects of different portion sizes of snack foods on food reinforcement.Design: Food reinforcement and liking were tested in 31 obese and 27 nonobese women at baseline and after 2 wk of daily consumption of 0, 100, or 300 kcal/d of the same snack food.Results: We found a significant interaction of phase, portion size, and body mass index on the pattern of operant responding for food. Obese women had a significant increase in food reinforcement after consuming the 300-kcal portion of food for 2 wk, whereas nonobese women had the opposite response. No significant differences were found on the reinforcing value with the 0-and 100-kcal portion-size conditions. Women in the 300-kcal group (obese and nonobese) reported a significant decrease in snack food liking from baseline to after daily intake.Conclusions: These findings suggest that obese and nonobese women respond differently to the daily intake of a snack food and that this may not be a viable mechanism for reducing food reinforcement in obese women. This trial was registered at www.clinicaltrials.gov as NCT00837694. Am J Clin Nutr 2009;90:304-13.