Make it a contest, thats what me and the wife are doing now. We both gained about 15lbs since we met. We are going on a 10 week diet, and changing our eating habits for good after(15lbs over 8 years isn't horrible especially considering 2 kids were involved and any guy thats been with a womend when she's pregnant will know what i mean). Part of this 10 week contest is weighins every 2 weeks, who ever wins 3/5 weighins gets their special prize which we picked ahead of time. Weight count lbs lost and fat % lost and add them together. Her prize is a day spa treatment, mine is a 2 hour �naked people movies� of us doing what ever i want, this got her REALLY motivated. Unfortunatly for her it got me really motivated too. After first weight-in I lost 8.5lbs and 3% bodyfat, she lost 4.0lbs and 1% bodyfat, and now she is more motivated then ever and I reap the benefits whether I win or lose.