[kitten chick]

I've been reading the "How do I tell my wife that she's overweight?" thread and it seems as though this is a more common issue than I would have thought. Some men even suggest leaving their wives due to weight gain. I was kind of surprised to read this. Of course everyone wants their SO to stay in shape but is it really that big of an issue, a deal breaker, enough to break up a marriage? I'm not asking with judgement I would just like honest opinions from people as to the importance of weight/looks in a relationship. At what point does a change in weight/looks become an issue (ie. how much of a change)?