What makes you eat twice as much at restaurants?

Dining with friends.

Via The Social Animal: The Hidden Sources of Love, Character, and Achievement:

At restaurants, people eat more depending on how many people they are dining with. People eating alone eat least. People eating with one other person eat 35 percent more than they do at home. People dining in a party of four eat 75 percent more, and people dining with seven or more eat 96 percent more.

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