Is your betrothed really so insecure, or even so superficial? Clearly it's an over-reaction but something must lie behind it and you might want to work out what before you commit your life to him.

And you're engaged to this guy, he sounds like a total jerk. My question is, did he have a piece of pie, he had no leg to stand on before, but if this is the case, he's even worse. Talk to him, tell him putting you down was uncalled for and inappropriate. Unless you are becoming unhealthy, he needs to keep his mouth shut, and even if you were, he can address it in a more sensitive way. Having one small piece of pie is not going cause obesity. Seems like he's pretty superficial and puts a lot of value into looks, which kind of makes it seem like he isn't the most stable person to marry. Marriage often implies you want to "grow old with that person" and as you get older, looks change.

Could've Always fought fire with fire "You'll probably end up limp as your grandfather but you don't hear me complaining huh

You need to have a talk with your fiance. One, you ate a small piece to be polite to your new landlords. Two, what you eat is your business. Three, how superficial is he that he's more worried about what you'll look like in 30, 40, 50 years than, I don't know, who you are as a person? Is he marrying you or acquiring a trophy?

dump dump dumb dumb dump!!

Sounds like as you get older he'd be the type to trade you on for a younger model, if you know what I mean.... Seriously, he sounds like an ass who should already be dumped.

You may want to sit down and reevaluate this relationship. Sit down, see how many events like this you can list. If it's happening with any regularity at all, the relationship probably isn't going to get better unless you confront him, and I would suggest not going forward until you do so and actually see improvement.