Watch what they eat
We’re all familiar with the personality phenomenon whereby after a few months of living together, you can start to develop the speech patterns and mannerisms of your roommate. According to a recently published study tracking the eating habits of 3,418 people between 1991 and 2001, the diet of your closest friends and family can rub off on you in much the same way.
Participants filled out a questionnaire two or three times over the course of the study about what they had eaten the previous week. Across all relationships, the eating pattern most likely to be shared involved a disproportionate amount of snacks and alcohol, as both are typically associated with socialization, and the relationship most likely to result in shared eating habits is marriage.