The authors of the new research paper said that data from most of the sixteen studies show that there is an impact.
The strongest evidence for the influence of friends on body weight came from a study that looked at the relationship between the body weight of friends and the body weight of respondents, as well as the risk of obesity. It turned out that the likelihood of obesity was higher in those whose friends were also obese. True, this is not about causality, but about correlation.
Other research also suggests that being with people who eat well can make us choose healthier foods. And a professor of appetite psychobiology at the University of Birmingham added that taking pictures of food on social media can make you want to eat. Therefore, if friends constantly post about food, you can unconsciously start following impulses.