There are three reasons for getting fat:
First, the focus of marriage has shifted from appearance management to life and family fun, pre-marital travel, and two rooms and one living room after marriage. Lifestyle changes have reduced the time for many people to exercise.
Second, the emotional management after marriage is different. If you care too much before marriage, you will care less after marriage. Emotional relaxation is easy to be broad-minded and easy to get fat.
Third, the diet structure has changed after marriage, and a person can cope with it. Both of them like delicacy and nutrition, so it's hard to get fat.