Holy hell. "Eat better and your degenerative disease will be fine?" That's not how it works. Seriously, unless you have an MD, do not try to dictate how your wife manages her chronic pain. Not even passive aggressively. I've got a chronic pain disease and I would kick you to the curb for the way you're acting, but I'm less forgiving than most.

You need to understand, she's going to be like this for the rest of her life. She'll probably get worse with age. There may be coping mechanisms and medications that help, however there is no cure. She will probably never be 100%. My guess is she has to do a lot of things to keep her spirits up as she lives with pain every day, things she enjoys that may not be so healthy. These things include eating a variety of food and probably taking a few extra smoke breaks. Are they the healthiest? No. But it's her choice because it's her health.

If you want to help her feel better, not make her better so she's more useful, then sit in on a specialist appointment with her. Study up on her condition with information from a professional. Conditions like hers don't ever just go away with a tiny bit of effort, but she can find relief with certain medications or medical devices like a wrist brace.