I think the notion of willpower is interesting. I've just read this study analysis, found it helpful. apa.org/helpcenter/willpowe...
Life gets in the way. Christmas gets in the way. There are different foci in our lives.
To loose weight takes a lot of mental space. And I'd like to think I'm fairly intellectual and don't like to think of the time spent thinking about loosing weight. But I do think about it a lot. When I'm successful, it's the only thing I think about. That is not good, you know what I mean?