Individual differences and moderating participant characteristics in the effect of reducing portion size on meal energy intake: pooled analysis of three randomized controlled trials.

Individual differences and moderating participant characteristics in the effect of reducing portion size on meal energy intake: pooled analysis of three randomized controlled trials.
Appetite. 2020 Nov 20;:105047
Authors: Robinson E, Haynes A
Abstract
Portion size impacts on the amount of energy consumed during a meal. However, research findings on participant characteristics that moderate the effect of portion size on energy intake are mixed. Using data pooled across three randomized control trials, we examined the impact of reducing meal portion size on meal energy intake in 111 adult participants varying in sex (55M, 56F), body weight (BMI range = 19-42) and a broad range of participant characteristics, including usual portion size, restrained, emotional and external eating, satiety responsiveness, plate clearing tendencies, concerns about wasting food and self-control. In each trial, a repeated-measures design was used and participants consumed three ad-libitum lunchtime meals differing in portion size; large-normal portion size condition (100%) vs. small-normal portion size condition (75%) vs. smaller than normal portion size condition (50%). In mixed ANOVAs, we did not find convincing evidence that any participant characteristic reliably moderated the impact that reducing portion size had on energy intake. For the majority of participants energy intake decreased when portion size was reduced and it was more common for participa...

Source: Appetite - November 20, 2020 Category: Nutrition Authors: Robinson E, Haynes A Tags: Appetite Source Type: research