Never mind your aunt's comments - it sounds like she's being kind of mean, if you ask me.
You know what? I don't think you should put up with this kind of thing. If anything, I'd be working on distancing myself a wee bit from someone who made comments like this.
Another thing? Some people have a way of criticizing or zero-ing on the one part of our lives that are going *well*.
I know that sounds absurd, but I've experienced it myself. Someone picks at the very thing that's going beautifully.
Sometimes it's just a matter of that person not being able to accept or deal well with major changes in a loved one's life/lifestyle, and so there's a bit of an effort to get you to "change back" to the way you were before. It might be that the changes you've made in your life are making others feel a bit uncomfortable (they may even find it a bit threatening), and hence the weird comments.
This doesn't make it ok (at all), but I wanted to point out that sometimes people get a little strange when you make radical changes. Sometimes, in some small way - people who are close to you can sometimes feel like they are being rejected when you reject your old way of life and do something new and different. They can even feel a bit left behind.
Not sure if this makes sense, but when I first embarked on a weight loss plan, after a few months in and it was clear that I *was* sticking to it, and it was working - some strange things happened. It seemed like people were purposely trying to get me to cheat on my diet.
It wasn't that they were trying to sabotage me, but rather - it was a case of "Oh, so you don't want to hang out and get a burger and fries with me anymore?" and so on. When you make a significant change, the people closest to you can actually feel like they are being rejected and even abandoned.
It's as if by saying you want to improve your health, size, shape, fitness or what have you - that this is a kind of rejection of your old way of life - and further - sometimes the people who are and were part of that old life feel like you're saying they're not ok either.
Of course, this isn't true at all - you're only trying to improve things for yourself - but in my experience, when you make big changes like this, the people around you can sometimes react a bit weirdly.
This isn't to say that your aunt's comments are ok at all though. Not entirely sure how you can nix this, but it's got to stop! Either she stops with the comments or you stop spending time with her until such time as she learns to get with the program.
You have long since moved on, and whether you gain or lose weight doesn't matter. You simply can't be put back in your 'place' ever again.
I think this is a good thing!