Are young couples who marry or cohabitate more likely to gai…

Are young couples who marry or cohabitate more likely to gain weight than those who stay single? Researchers followed 8000 men and women for 7 years.  At the start of the study, none of the participants were married or living with their romantic partner.  The researchers found that women who married or cohabitated during the study gained 0 more pounds than single women, and married or cohabitating men gained, on average, 6 pounds more than single men.    What conclusions can be made based on the results of this study?