If it happened because she did a complete 180 in terms of personality, life goals, values etc then yeah there would be some problems in the relationship at that point.

Boring dystopia

Her personality, life goals, and values are defined by not getting fat? Give her more credit man, you're making her sound as shallow as you are.

Well then either it’ll work or it won’t lol, not much else one could really say to that

They’re defined by regularly making healthy life decisions, which was an essential trait in someone I would ever marry and vise versa for her

Still sounds pretty shallow dawg

meanwhile I'm reading Lucem's posts like
https://i.imgflip.com/3hrf07.jpgvia Imgflip Meme Generator

But if she can't take care of herself how can he be sure she will take care of him???

Its just a values thing frown you wouldn't understand.

As in thin people have more societal and economic value

Bro you're married, no kids, and economically well off enough to buy a house in your 20s. That's about as privileged as it gets. I'll bet you ten bucks after you have your first kid your nice little diet plan goes right the **** out the window cause you're too tired for that **** and picking up KFC on the way home sounds like a really good alternative. Pump out another kid and your wife's gonna let her body go cause she's not a celebrity who has nothing better to do than exercise all day and then you're gonna get a nice dad gut to match. (Unless you're just that shallow of a yuppie that your self image can't handle anything but looking like an LL Bean catalog.)

And then imagine being a single parent, two kids, two jobs, and barely enough time and energy to even go to KFC.

It's nice to know YD hasn't changed. Just calmer hormones.