OK, seriously.
People are very aware of what they look like, but there are usually many factors that can result in weight gain:
-Having kids.
-Stress.
-No time to exercise.
-No time to prepare healthy meals.
-Exhaustion.
A concerned and helpful husband can:
-Set up time to go walking together.
-Watch the kids occasionally, so she can go to the gym, or use a home treadmill.
-Housekeep occasionally, for the same reason.
-Help prepare and shop for healthier foods.
-Be encouraging instead of critical.
-Diet together.