Maybe it is nothing to do with depression. I am like that at the moment where I am back on the trail of trying to loose weight (again) and I just cannot get the motivation to get back into it. The reason I am saying to you that it may not be depression is bacause I work with mostly ladies and they have the same problem as me in regards and they are not depressed, (well most of them anyway!). I do hope that you get your zest back. Best wishes.