Are you exercising regularly? If not, I suggest you start there -- not because of the extra calorie burn, but because exercising tends to keep us focused on making healthier choices overall.

I'm a veteran yo-yo dieter, and what you describe has happened to me at least 6 or 7 times. This time, at age 56, I've been able to maintain for a year and a half and I'm still going strong. The only difference from previous maintenance attempts is that I now exercise 4 times a week, no matter what is going on in my life. I still overeat fairly regularly, but I'm able to rein myself in the next meal or the next day -- thanks to the mental mindset afforded by exercise, I believe.

Freelance