My wife has gotten fat and now we have no love life. What to do? She doesn't seem interested in losing weight.
Tough question but the short answer is that she is your wife and supporting her with patience and acceptance is key to the relationship and your love life.
She is probably aware of the changes with her body and you have probably changed in ways as well. Change is inevitable and flexibility is required to adapt/adjust towards a healthy relationship.
If she’s not interested in losing weight, what is she interested in doing? Have you guys talked about the changes with your love life? If not, I would suggest doing so and setting mutual goals to improve it. Are you both eating healthy, talking care of yourselves as individuals and as a couple? Bodies will change and unfortunately it’s usually not for the better, so, if that is the foundation of the marriage then there may be bigger problems.
I hear your concern about the decline in your love life and I would say it is not all your wife’s weight causing the change. It may be a contributor but I’d suggest directing your attention at what’s going on in the relationship, not just with her body.