The group from Dalhousie University in Halifax tracked 208 heterosexual couples, HealthDay reports. Their subjects were all in their early 20s, with at least one a college student, had been dating for at least three months and saw each other five times a week or more.
The researchers found a person's drinking behavior could be predicted by that of their partner.
"In some respect this is a cautionary piece of research. Pick your friends and lovers carefully because they influence you more than you think," Simon Sherry, an assistant psychology professor at Dalhousie, said in a news release.
More research needs to be done on whether heavy drinkers tend to gravitate towards each other and on whether both partners in a relationship involving heavy drinking tend to have alcoholic relatives, the team said.