New York Obesity Nutrition Research Center, Department of Medicine, St. Luke's-Roosevelt Hospital Center, Columbia University Medical Center, New York, NY 10025; Department of Psychology, Touro College, New York, NY 10010.
Obesity (Silver Spring). 2013 Dec;21(12):E542-8. doi: 10.1002/oby.20484. Epub 2013 Jul 5.
To assess the effects of a 50% discount on low-energy density (ED) fruits and vegetables (F&V), bottled water, and diet sodas on shoppers' purchasing, food intake, and body weight.
A randomized, controlled trial was conducted at two Manhattan supermarkets, in which a 4-week baseline period (no discounts) preceded an 8-week intervention period (50% discount), and a 4-week follow-up period (no discounts). Twenty-four hour dietary recall, as well as body weight and body composition measures were obtained every 4 weeks. Participants (n = 47, 33f; 14m) were overweight and obese (BMI ≥ 25) shoppers.
Purchasing of F&V during intervention was greater in the discount group than in the control group (P < 0.0001). Purchasing of these items by the discount group relative to the control group during follow-up was reduced from intervention (P = 0.002), but still remained higher than during baseline (P = 0.01), indicating a partially sustained effect. Intake of F&V increased from baseline to intervention in the discount group relative to the control group (P = 0.037) and was sustained during follow-up. Body weight change did not differ significantly between groups, although post hoc analysis indicated a change within the discount group (-1.1 kg, P = 0.006) but not within the control group.
Discounts of low-ED F&V led to increased purchasing and intake of those foods.
评估对低能量密度（ED）水果和蔬菜（F&V）、瓶装水和无糖苏打水给予 50%折扣对购物者购买、食物摄入和体重的影响。
在两家曼哈顿超市进行了一项随机对照试验，其中包括 4 周的基线期（无折扣），随后是 8 周的干预期（50%折扣）和 4 周的随访期（无折扣）。每 4 周进行一次 24 小时饮食回忆，以及体重和身体成分测量。参与者（n=47，33 名女性；14 名男性）为超重和肥胖（BMI≥25）的购物者。
干预期间，折扣组的 F&V 购买量明显多于对照组（P<0.0001）。与对照组相比，折扣组在随访期间的这些物品购买量较干预期有所减少（P=0.002），但仍高于基线期（P=0.01），表明部分效果持续存在。与对照组相比，折扣组的 F&V 摄入量从基线期增加到干预期（P=0.037），并在随访期间持续增加。两组体重变化无显著差异，但事后分析表明折扣组（-1.1 公斤，P=0.006）有所变化，但对照组没有。
对低 ED F&V 的折扣导致这些食品购买和摄入增加。
