BUT....

Attitude is NOT everything, not at all.  What IS everything is action. You can think lowcarb is the greatest thing around, you can think it is the only thing that works well for your body, you can believe with all your heart in lowcarb (attitude) and still not follow it (action).

Following it when (subconsciously) we believe we don't NEED to anymore, or heck, at least not so stringently, or not ALWAYS, is what so very often opens Pandora's Box in those who are fortunate and hard working enough to stay with it long enough to even GET to goal in the first place.

So another vitally important key is to keep the actions consistent with the attitude, and my approach to that, which has worked very well for a very long time now, is to lead with the diet—lead with the actions. And let my attitude follow that.

After 30 years of ultimately unsuccessful "dieting" (losing my weight twice and keeping it off for more than 2 years the second time, but still eventually regaining it all), I believe that my fundamental flaw was trying to think/believe myself into new actions. What worked (and still does) was to act myself into new thinking, by always eating according to plan.