This is good advice. I do care and want to help as much as I can. I love my wife unconditionally and she is beautiful just the way she is. I hope you are trying to help with these comments, so I am going to take them that way. I am always positive with any goal my wife has, I would put her goals ahead of mine any and every time. The things that come easy for me do not come easy for her, staying lean while eating crap food. I want to see her succeed above all. I thank all of you for participating in this thread, it appears that I am not the only one with this situation.
I'm being sincere and adding a bit of humor.
Seriously though, I'd hate to read a thread by you in 6 months saying that your wife is leaving you because she thinks you kept calling her fat when all you were trying to do was help her with her diet. You said she is beautiful as is. Remind her of that every day in word and deed, and let her eat your food without saying a word. If she wants your help she will ask for it.
If she likes to run, maybe you should get into running a little? Maybe you asking for her help would inspire and motivate her more to achieve her goals ("hey honey, I would like to start doing more cardio for my heart health, and you've always been into running and cardio so would you help me?")? I'm sure a little cardio wouldn't hurt your goals for gains, and it would be good for your heart. There's other things you could do too like riding bikes, swimming, going for hikes, playing tennis...whatever she might be interested in. If you just aren't a runner, then maybe you could ride a bike with her while she runs? Or just become a runner.
Maybe she will start wanting to go to the gym with you then and maybe she will ask for your help on figuring out a diet she can stick to. Not because she needs to lose any weight of course, but because you would do anything for her and you love to make her happy.