Brunstrom Jeffrey M, Rogers Peter J, Pothos Emmanuel M, Calitri Raff, Tapper Katy
Department of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol BS8 1TU, UK.
Appetite. 2008 Sep;51(2):296-301. doi: 10.1016/j.appet.2008.03.005. Epub 2008 Mar 20.
This paper (i) explores the proposition that body weight is associated with large portion sizes and (ii) introduces a new technique for measuring everyday portion size. In our paradigm, the participant is shown a picture of a food portion and is asked to indicate whether it is larger or smaller than their usual portion. After responding to a range of different portions an estimate of everyday portion size is calculated using probit analysis. Importantly, this estimate is likely to be robust because it is based on many responses. First-year undergraduate students (N=151) completed our procedure for 12 commonly consumed foods. As expected, portion sizes were predicted by gender and by a measure of dieting and dietary restraint. Furthermore, consistent with reports of hungry supermarket shoppers, portion-size estimates tended to be higher in hungry individuals. However, we found no evidence for a relationship between BMI and portion size in any of the test foods. We consider reasons why this finding should be anticipated. In particular, we suggest that the difference in total energy expenditure of individuals with a higher and lower BMI is too small to be detected as a concomitant difference in portion size (at least in our sample).
本文（i）探讨了体重与大份食物量相关这一命题，（ii）介绍了一种测量日常食物量的新技术。在我们的范例中，向参与者展示一份食物的图片，并要求他们指出该食物量比他们平常的量更大还是更小。在对一系列不同的食物量做出反应后，使用概率分析计算出日常食物量的估计值。重要的是，这个估计值可能是可靠的，因为它基于许多反应。151名一年级本科生完成了针对12种常见消费食品的我们的程序。正如预期的那样，食物量由性别以及节食和饮食限制的一种测量方法预测。此外，与饥饿的超市购物者的报告一致，饥饿个体的食物量估计往往更高。然而，我们没有发现任何测试食品中BMI与食物量之间存在关系的证据。我们思考了为什么应该预料到这一发现的原因。特别是，我们认为BMI较高和较低的个体在总能量消耗上的差异太小，以至于无法作为食物量上的伴随差异被检测到（至少在我们的样本中是这样）。
