In this article, we see that the what we choose to eat is a part of social norms. We make decisions on what to eat based on what others are eating around us. This definitely is something that makes food trends, for example, juicing. I feel like this also based on location as well. There's a reason why in Southern California there's a froyo place literally on every corner; there it is a social norm, as well as being something popular and trendy, to eat.
The article also talk about how social norms can divert us from eating certain things. If one were to see an unhealthy person eating mcdonalds they probably would choose a healthier option seeing as a cause and effect situation right in from of them.