The tendency to eat more food when eating with others illustrates a phenomenon called

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Social facilitation refers to the tendency for individuals to perform better on simple or well-learned tasks when in the presence of others, but to perform worse on complex or novel tasks. In regards to eating, the presence of others may increase arousal and lead to an increase in food consumption. This phenomenon has been observed in various settings, including social gatherings and restaurants.

The Tendency to Eat More Food When Eating with Others