Most people are lazy weak willed gluttons but in addition to that, the food industry is exploiting these moral failings. McDonalds tried serving healthier food but the gluttons rejected it. Gluttons prefer food that is quick and easy.
The reason most people fail to lose weight and keep it off is because they are self-centered piggies.
If you think your fat spouse is going to behave responsible when it comes to food. Forget it!