I love you honey, but don't get fat!

Now, before you go yelling my name and profanities, I have spent my life as a woman with weight issues. So don't even start to give me any shit.
And feel free to say my name in vein, but at least have a better reason to do it.
What if you all of a sudden realized that your spouse/significant other has decided to let it ALL GO! Whether it's their weight, their hair, their hygiene, their diet, take on a new addiction, jumped back into an old one? If your spouse says, I love you honey, but don't get fat? What if you want to say something similar to them? How do you respond to that? How would they respond? Of course we will all use our nice words and say it differently. However, aren't you supposed to love them for better or worse, blah, blah, blah. And them you? Sure we will still love them if they put on a few, but when you notice it's going to far, where do you draw the line before you say, well, lets figure out what you need to do to make yourself feel better.
Now weight, not the only issue, there are many, many more. If they walk out of the house after not showering for a few days, their clothes not as clean as you would like them to be? Etcetera...
Marriage is and should always be a mutually beneficial arrangement.
Now, am I saying that this is the only aspect to chemistry? No, I am not that stupid, but let's be real, attraction, lust, mind-blowing sex are the benefits of a great marriage, but if you don't have chemistry, if you don't appreciate your partner's appearance, then you are going down a very bumpy road.
I am very attracted to my husband, and like in all marriages you have to check in from time to time. We are our own worst critic when it comes to what we want from ourselves and our appearances. But you have to realize, you made a commitment to this person, and you not giving a shit about yourself or what you look like, well, that can come right back to bite you in the ass, whether its a big ass or a small ass, don't matter at all.
Chemistry in marriage is a real issue, you lose that, where the hell do you go from there?
Now don't even get me started on marriages that don't even start out with it. Because I may even start shouting profanities.