You can help, too. Often husbands want their wives to lose weight, but they aren't willing to stop buying and eating the offending foods. Your whole family must develop healthy eating habits if weight control is going to be an achievable long-term goal for your wife. Whether or not your wife chooses to work on eating and exercise habits, you must begin to focus on her positive qualities. Affirming your love for her in spite of her weight is crucial.
Some people use their weight to test the love of significant people in their lives.
This especially happens to women whose parents were conditional in the way they gave and received love. It might be helpful for you to create a list of your wife's positive attributes, and keep adding to it. Then regularly mention the things you value in her. Enjoy her touch of your body. Enjoy looking into her eyes.