“Don’t worry, be happy” – Remember that being overly obsese proves your faith in HaShem since you are so how anxious you are to arrive in Olam Ha-Ba. Whether this appeals to women will depend on how whether they look favorably on the idea of widowhood. The reality is that a serious overweight person in their 20s (when most people get married), will probably make it to 60, by which times the kids are grown, and the family probably can do just as well with an inheritance rather than a steady income (and especially better than a steady income undermined by health issues).
Remember, we are supposed to look at the bright side and be happy.