Women in groups eat more

Seems like the larger the group, the higher the intake of calories.

However, if a woman eats with a smaller group of female friends, she eats less. When she dines with a man, she eats even less.

When women ate with men, they took in about 552 calories, but when eating with another woman, took in about 665.

'When it is a date situation, that's when we see a big difference,"
Prof Young said. 'As soon as there is a man in the mix, the amount of calories a woman eats decreases."

As the number of men in the group increased, the calorie count in the women's meals decreased, she found.

Prof Young suggested it may be due to social conditioning.
She said that other studies have found that thin women and women who eat less are viewed as more attractive.

source : http://health.asiaone.com/Health/Women%2527s%2BMatters/Story/A1Story20090813-160915.html