How overweight?
30 pounds? 40 pounds? 50 pounds?
It's funny, when I was growing up, I never realized how much men hate overweight women until I hit about 12 years old. My Dad started remarking about how he absolutely will not associate with fat women. Then, I started hearing my friends and other guys talk about their distaste for overweight women. Although my Dad hates fat women more than the typical guy, I have met many men who severely stay away from overweight girls.
If I had to give young women advice for their future, I would first tell them to stay in school. If they weren't interested in studying, I would tell them to exercise and watch their weight. A girl can be mean, nasty, bitchy, dishonest etc. Nothing is as much of a social status killer as being overweight.