Babies do a lot more than just playing with their sippy cups on the dinner table, says a new study.
A Cornell University study says that babies pay close attention to what food is being eaten around them and especially who is eating it.
The study adds that evidence to a growing body of research suggesting even very young children think in sophisticated ways about subtle social cues.
The authors found one-year-olds expect people to like the same foods, unless those people belong to different social or cultural groups, such as those that speak a different language.
The study underscores just how tightly our food choices are coupled with our social thinking, said Katherine Kinzler, a co-author of the study.
"Kids are sensitive to cultural groups early in life," said Kinzler, adding, "When babies see someone eat, they are not just learning about food - they are also learning about who eats what with whom. An ability to think about people as being 'same versus different', and perhaps even 'us versus them,' starts very early in life."
Kinzler and her co-authors, Zoe Liberman, Amanda Woodward and Kathleen Sullivan, set up a series of studies in which they showed more than 200 one-year-olds a series of videos of people expressing like or dislike of foods. When the babies saw two people in the video speak the same language or act as if they were friends, the children expected them to like the same foods.
When they saw two people who spoke different languages or acted as if they were unfriendly, the babies expected them to like different foods.
The studies took advantage of a well-known fact in developmental psychology: Babies will look longer at novel actions or things that deviate from their general expectations of the world.
The study also showed babies have a slightly different take when it comes to foods that might harm them. When the babies saw a person act disgusted from eating a food, they expected that a second person would also be disgusted by that food, even if the second person was from a different social group.
The researchers discovered an insight into what babies identify as meaningful cultural differences. While monolingual babies expected people who speak different languages to like different foods, bilingual babies expected that people who speak different languages would eat the same foods. They might have had experience with this in their own home, where people speaking different languages are gathered around the table.
"Language wasn't marking groups in the same way for these kids," Kinzler said.
The work may have implications for policymakers interested in shifting people's unhealthy eating habits.
"If you're thinking about places to intervene in people's eating, framing food selection as a social problem as opposed to a nutritional problem might be a good way to get at it," Kinzler said.
Parents might consider that their children are watching as they eat together. "If you feed your child the perfect diet, yet your child sees you and your friends and family eating junk food, she is presumably learning about foods from her social experiences, too," she said.
The study has been published in Proceedings of the National Academy of Sciences.
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