How group size changes our eating behavior at a buffet:
If you are with one other person, you will eat 35 per cent more calories than if you dine alone. In a group of eight, you're looking at a whopping 90 per cent increase. … [I]f a woman is next to a man at a buffet, about 12 per cent of what ends up on her plate will be determined by what he takes. If she's next to another woman, that jumps to 44 per cent. So women are influenced by both sexes. By contrast, men's choices were unaffected by either.
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