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Published Online First: 14 February 2007. doi:10.1136/adc.2006.103259
Archives of Disease in Childhood 2007;92:384-387
Copyright © 2007 BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health.

ORIGINAL ARTICLE

Eating in larger groups increases food consumption

Julie C Lumeng, Katherine H Hillman

Center for Human Growth and Development, University of Michigan, Ann Arbor, Michigan, USA

Correspondence to:
Dr J C Lumeng
Center for Human Growth and Development, 300 North Ingalls Building, 10th Floor, University of Michigan, Ann Arbor, Michigan 48109–0406, USA; jlumeng{at}umich.edu

Objective: To determine whether children’s food consumption is increased by the size of the group of children in which they are eating.

Design: Crossover study.

Setting: University based preschool.

Participants: 54 children, aged 2.5–6.5 years.

Interventions: Each child ate a standardised snack in a group of three children, and in a group of nine children.

Main outcome measures: Amount each individual child consumed, in grams.

Results: Amount eaten and snack duration were correlated (r = 0.71). The association between group size and amount eaten differed in the short (<11.4 min) versus the long (>=11.4 min) snacks (p = 0.02 for the interaction between group size and snack duration). During short snacks, there was no effect of group size on amount eaten (16.7 (SD 11) g eaten in small groups vs 15.1 (6.6) g eaten in large groups, p = 0.42). During long snacks, large group size increased the amount eaten (34.5 (16) vs 26.5 (13.8), p = 0.02). The group size effect was partially explained by a shorter latency to begin eating, a faster eating rate and reduced social interaction in larger groups.

Conclusions: Children consumed 30% more food when eating in a group of nine children than when eating in a group of three children during longer snacks. Social facilitation of food consumption operates in preschool-aged children. The group size effect merits consideration in creating eating behaviour interventions.


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