Portion Size Effects on Body Weight: Free Living Setting

份量对体重的影响：自由的生活环境

基本信息

批准号：
8443862
负责人：
SIMONE A. FRENCH
金额：
$ 54.93万
依托单位：
UNIVERSITY OF MINNESOTA
依托单位国家：
美国
项目类别：
财政年份：
2010
资助国家：
美国
起止时间：
2010-04-01 至 2015-03-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8443862
关键词：
Address Adult Affect Behavioral Mechanisms Body Weight Body Weight Changes Boxing Child Chronic Cognitive Control Groups Data Disinhibition Eating Eating Behavior Effect Modifiers (Epidemiology)Energy Intake Environment Experimental Models Exposure to Food Food Packaging Hunger Hyperphagia Individual Individual Differences Intervention Laboratories Laboratory Study Life Long-Term Effects Measures Mediating Mediator of activation protein Obesity Overweight Participant Perception Play Process Public Health Randomized Relative (related person)Research Restaurants Risk Role Sampling Satiety Response Scientist Solid Testing Theoretical model Weight Gain Work base effective intervention environmental intervention food environment hedonic novel prevent protective effect psychobiologic public health relevance secondary outcome social norm trait

项目摘要

DESCRIPTION (provided by applicant): The proposed research is of extremely high significance for public health. Overweight and obesity affect the majority of US adults and a growing proportion of children and youth. The causes are not well understood, but are believed by most scientists to be largely due to a food environment that promotes excess energy intake. Large food portion sizes are thought to play a significant role in overeating, and are pervasive across virtually every setting in which people live, work and socialize. Highly controlled laboratory studies have provided strong evidence that large portion sizes have short-term effects to increase energy intake, but have not investigated the longer-term effects of large portion sizes on energy intake or body weight change. Small portion sizes have not been evaluated for their potential protective effects on energy intake or body weight change. The proposed research bridges a crucial gap from the laboratory to the naturalistic environment by creating a novel model experimental paradigm through which to test the effects of portion sizes in free-living people in the natural environment. The research addresses a critical public health question of whether the pervasive large portion sizes are contributing to excess weight gain among free-living people and are therefore a potent public health risk exposure for overweight, obesity and excess weight gain. No data currently exist that directly address this important public health question. The proposed study aims to examine the effects of large and small portion sizes on body weight over a six-month period among a free-living sample of 200 adults. Change in energy intake is a secondary outcome. Potential moderators and mediators of the association between portion size and body weight change will be examined in an exploratory manner. Participants will be randomized to one of four study conditions for a six-month period: Lunch meal portion size 400 kcal, 800 kcal or 1600 kcal or a no-intervention control group. Participants in the portion size lunch groups will be provided with one lunch meal daily 5 days per week for the six-month period. Body weight and energy intake will be measured at baseline, one, three and six months. It is hypothesized that participants will gain weight in the 1600 kcal portion size condition relative to the 800 kcal portion size condition and relative to the control group.

描述（由申请人提供）：拟议的研究对公共卫生具有极其重要的意义。超重和肥胖影响着大多数美国成年人以及越来越多的儿童和青少年。其原因尚不清楚，但大多数科学家认为很大程度上是由于食物环境促进了能量摄入过多。人们认为，食物份量过大是导致暴饮暴食的一个重要因素，而且几乎在人们生活、工作和社交的所有环境中都普遍存在。高度控制的实验室研究提供了强有力的证据，表明大份量对增加能量摄入有短期影响，但尚未研究大份量对能量摄入或体重变化的长期影响。尚未评估小份量对能量摄入或体重变化的潜在保护作用。拟议的研究通过创建一种新颖的模型实验范式来测试自然环境中自由生活的人的份量大小的影响，从而弥合了从实验室到自然环境的关键差距。该研究解决了一个关键的公共卫生问题，即普遍存在的大份量是否会导致自由生活的人体重过度增加，从而成为超重、肥胖和体重过度增加的潜在公共卫生风险暴露。目前没有数据可以直接解决这一重要的公共卫生问题。拟议的研究旨在以 200 名自由生活的成年人为样本，研究六个月内大份量和小份量对体重的影响。能量摄入的变化是次要结果。将以探索性的方式检查份量大小和体重变化之间关联的潜在调节因素和调节因素。参与者将被随机分配到四种研究条件之一，为期六个月：午餐份量为 400 kcal、800 kcal 或 1600 kcal，或无干预对照组。在六个月的时间里，份量午餐组的参与者将每周 5 天每天享用一顿午餐。将在基线、第一个月、第三个月和六个月时测量体重和能量摄入量。假设相对于 800 kcal 份量条件和对照组，参与者在 1600 kcal 份量条件下体重会增加。