Most Helpful Guy
Usually swat her behind. She may fake anger, but actually she loves the compliment.
I don't reassure her too much, she will take that as just trying to make her feel better, and think you aren't being sincere.
I try to be practical, and suggest changes in her diet and exercise habits. There's no point denying it if she's overweight... that will just make her MORE insecure, since she knows perfectly well she's overweight.2