That's true because if you make healthy eating choices and healthy eating habits for example you will be healthier then if you make bad eating habits for example eating fast food everyday you will more then likely be overweight but if you eat right and exercise you will be a lot healthier.
Experience more stress Less financial stable ( money) Poor, Experience unhealthy ways and issues Maturity conflicts Unfaithful( maybe depends on certain situations, or either just wants out of the marriage)