This is absolutely my problem, too. After hovering around 162-164 for about three years - yeah,
three years! - I finally broke into the 150's this winter. Now I'm stuck in the low 150's, taking one step forward and one step back, over and over.
I think it's both a mind and body issue. We've adjusted mentally and physically to what it takes to get to and maintain a particular "decade" of weight. We're comfortable here. We've done so well. And now we have to change our routine...
again? And eat
less to keep losing? How unfair is that?!
To get below that 160 mark, I had to re-evaluate my plan, decrease my calories, and hit the gym 4-5 days a week with increased intensity. What to do to get into the 140's, I haven't yet figured out! Like JayEll said, it may just be a matter of getting more disciplined than I've been in the past.
Anyway, I can relate. I'm sure we'll break through when we're ready to really work at it!