A review of more than 600 studies found that being married, and transitioning into marriage, are both associated with weight gain. Transitioning out of a marriage, however, is associated with weight loss. The researchers found that weight gain occurs because of increased opportunities for eating due to shared, regular meals and larger portion sizes, as well as “decreased physical activity and a decline in weight maintenance for the purpose of attracting an intimate partner,” Zero Belly Smoothies states. we’re hardly advocating staying single or getting a divorce (unless you choose to) this research clearly indicates that dieters need to be especially careful around the wedding day. To keep things in check after you take the plunge, meal prep with your partner or develop a workout routine together.