<human>: Can you succinctly summarize the text in 1-3 sentences?

My fiance has gained about 20 lbs since I first met her, and it is affecting my attraction towards her. I'm in good shape, always have been. She was in excellent shape when I met her, and then had some stressful times and put on 20 lbs from lack of exercise and poor eating habits. I admit that I've always been attracted to thin/fit girls and I can't really help what I'm attracted to, but I don't want to be a dick about it and make her feel unattractive because I don't compliment her as much.

She has been working to lose the weight over the last few weeks, so that is encouraging. But she has noticed that I compliment her less than I used to when she was in shape, because I would always compliment her butt, want to touch it, etc...but it just honestly doesn't look great right now anymore and so if I did that it would be a lie and I'd have to force it. 

I don't want her to feel less attractive because of the weight gain, especially because she is working on it now and knows she needs to slim down. But at the same time, I am not unconsciously complimenting her because there is less attraction, and she notices it.

Is there anything I can do to make her feel better without having to lie? She is very very sensitive so if I said anything that had even a 1% chance of being construed as calling her fat, I would get a bad reaction. That means I can't even compliment her on her progress because that would be saying I think she is heavy now and needs to slim down, etc...
<bot>: Fiance gained some weight and it has lowered my attraction to her, she notices that I compliment her body less and it makes her feel unattractive. How can I make her feel attractive while not also lying about it?