Hello food thief: I see this is your first post here on PC. So... welcome to PsychCentral. I'd have to admit I'm not sure what type of mental health condition your concern would fall under. There is a forum, here on PC, dedicated to the subject of eating disorders. So perhaps that might be one forum you would want to take a look at. Here's a link:

https://forums.psychcentral.com/eating-disorders/

Another forum that may be of interest would be the relationships & communication forum:

https://forums.psychcentral.com/rela...communication/

I suppose the other way to look at this, though, might be as a habit you need to break. So, with that thought in mind, here are links to 6 articles, from PsychCentral's archives, on the subject of how to break a bad habit:

Need to Form a New Habit? 66 Days

7 Steps to Changing a Bad Habit

The Golden Rule of Habit Change

https://psychcentral.com/blog/scienc...dium=popular17

https://psychcentral.com/blog/using-...dium=popular17

https://blogs.psychcentral.com/mindf...dium=popular17

I hope you find the answers to your dilemma here on PC.

P.S. I presume there must be some reason why simply having your own food on hand so that you don't need to steal your wife's wouldn't work? If the answer to that is that you'd eat that too, then perhaps this is a type of eating disorder & what is going to be needed here is treatment for that.