Priority Research Centre in Physical Activity and Nutrition, Nutrition and Dietetics, School of Health Sciences, Faculty of Health and Medcine, University of Newcastle, Callaghan, NSW, Australia.
Priority Research Centre in Physical Activity and Nutrition, School of Education, Faculty of Education and Arts, University of Newcastle, Callaghan, NSW, Australia.
Eur J Clin Nutr. 2014 Jan;68(1):64-70. doi: 10.1038/ejcn.2013.194. Epub 2013 Oct 16.
BACKGROUND/OBJECTIVES: The primary aim of this secondary analysis was to compare changes in dietary intake among participants randomized to two versions of a 12-week commercial web-based weight loss program (basic or enhanced) with a waiting-list control. An additional investigation compared changes in dietary intake of successful participants (weight loss ≥5%) with those not successful.
SUBJECTS/METHODS: Dietary intake was assessed at baseline and 12 weeks using a validated 120-item semiquantitative food frequency questionnaire. Adults (n=268, 60% female participants, body mass index 32.1 ± 3.9) classified as plausible reporters of energy intake were included in the analyses. Analysis of covariance with baseline observations carried forward for drop-outs (n=38) was used.
The basic and enhanced groups significantly increased their percentage of energy contribution from fruits and reduced energy-dense, nutrient-poor foods compared with controls (P<0.001). Successful participants (n=49) reported superior improvements in dietary intake including greater reductions in the mean daily energy intake (P<0.001), the percentage of energy from energy-dense, nutrient-poor foods (-12.0% E vs -4.3% E, P<0.001) and greater increases in the energy contribution from fruits (P<0.001), vegetables (P=0.003) and breads/cereals (P=0.02).
Use of a commercial web-based weight loss program facilitated some improvements in the dietary intake. The enhanced web-based tools appeared not to have generated greater improvements in reported dietary intake, compared with the basic or control groups. Those who achieved a weight loss of ≥5% improved their dietary intake in line with the program recommendations and dietary guidelines. Further research to determine web-based components that may improve success and the reasons why programs are successful for some participants is required.
背景/目的：本二次分析的主要目的是比较随机分配到两种 12 周商业网络减肥计划（基础或增强版）与候补对照组的参与者在饮食摄入方面的变化。另一项调查比较了成功减肥者（体重减轻≥5%）与减肥失败者的饮食摄入变化。
受试者/方法：采用经过验证的 120 项半定量食物频率问卷，在基线和 12 周时评估饮食摄入。纳入分析的是能量摄入可能报告合理的成年人（n=268，60%为女性参与者，体重指数 32.1±3.9）。对失访者（n=38）采用基线观察值向前结转的协方差分析。
基础组和增强组与对照组相比，水果在能量贡献中的百分比显著增加，而能量密集、营养贫乏的食物则减少（P<0.001）。成功减肥者（n=49）报告称，饮食摄入有了更好的改善，包括每日能量摄入量的平均减少（P<0.001）、能量密集、营养贫乏食物的能量百分比减少（-12.0% E 与-4.3% E，P<0.001）以及水果（P<0.001）、蔬菜（P=0.003）和面包/谷物（P=0.02）的能量贡献增加。
使用商业网络减肥计划有助于改善饮食摄入。与基础或对照组相比，增强型网络工具似乎并没有在报告的饮食摄入方面产生更大的改善。体重减轻≥5%的人按照计划建议和饮食指南改善了饮食摄入。需要进一步研究确定可能提高成功率的网络组件，以及为什么某些参与者的计划成功。
