Temptation is everywhere. Isn't it great to say "No" and be able to actually do it?
As you are well aware, any new "diet" or self-control regimen must become a Way Of Life or you go back to where you began. And that never ends, it just (hopefully) gets easier.
I am sure that 21 months has changed you in more ways than just pants size. Great job.
It's definitely a "way of life" with me now. I just got back from my morning walk. Two years ago, I couldn't imagine dragging myself out of bed at 5AM to walk in sub-freezing weather. But the human body is incredibly adaptable.