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Humans learn which behaviors pay off and which don't from watching others. Based on this, we may draw conclusions about how to act—or eat. In the latter's case, people may use each other as guides to determine what and how much to eat. This is called social modeling and is one of the most powerful social influences on eating behavior.

In a new study, researchers in the UK investigated whether observing others' facial expressions while eating raw broccoli influenced young women's liking and desire to eat raw broccoli.

"We show that watching others eating a raw vegetable with a negative facial expression reduces adult women's liking of that vegetable, but not their desire to eat it," said Dr. Katie Edwards, a researcher at the Aston University School of Psychology and lead author of the study published in Frontiers in Psychology. "This highlights the power of observing food dislike on adults' eating behavior."