And all of a sudden, the number on the scale is going up. What gives? You can blame it on something called “dietary convergence.” That’s when you start eating like the people you’re living with. Now, if you moved in with a vegan, whose favorite foods are broccoli and tofu, you probably don’t have an issue with dietary convergence… because your vegan roommate is probably prompting you to eat healthier foods. But nutrition professor Lauren Dinour, at Montclair State University, says, what usually happens is you and your new living partner end up eating worse. Dinour says most men will pack on 4 pounds after tying the knot – women will gain 7 pounds in the first year. And the same is true for unmarried couples who live together. Just so you know.