Valentine's Day is right around the corner. You know that the over-sized, heart-shaped box of chocolates doesn't do your hips any favors, but did you know that simply being in a relationship might make you fat?

Several studies have indicated that people tend to gain weight after getting married. Joy Bauer, the nutritionist and diet editor for The Today Show, reasons that married people no longer feel the pressure of the dating scene. Plus, you might pick up on your spouse's unhealthy habits. Joy's husband, for example, has an affinity for Mallomar cookies, buffalo wings and Cap'n Crunch. Obviously, she steers clear of these treats.

Check out the gallery for some of Joy Bauer's tips on staying fit once you're hitched.