A woman’s choice of food is influenced by the gender of her dining companions, according to a new study published in Appetite. MResearchers at McMaster University in Canada observed 469 students as they ate in university cafes.

Two women eating together consumed an average of 665 calories each, but for a male and female pair the woman opted for just over 550 calories. When women dined in larger groups without men, their calorie consumption edged higher to almost 800. Men seem to eat the same amount regardless of their dining partners; a little over 715 calories on average.

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