Congratulations to the both of you! You're a saint for doing this for your wife. You probably saved her life.
I've lost right at 30# by changing the way I eat. I started out by eliminating sugar. Then I started eating "clean" which means mostly whole foods, multi grains, lots of fruit. veggies and water. No processed food. I feel so much better. I can eat like this the rest of my life. I'd like to lose about 10 to 15 more pounds.
I'd love to hear more about your eating plan.