Suppressed appetite

This may not be the right place to post this but since it concerns my wife I’ll do it anyway. Since we moved a year ago I’ve found I’m rarely hungry and when I do eat it doesn’t take much to fill me up. I’m not purposefully starving myself and I haven’t suffered from eating disorders in the past. Most of the extreme stress I was under before has subsided so I’m don’t think it’s that. My wife has mentioned it over the course of the last year and I know she’s worried but I don’t know how to fix it. Any suggestions?