It's not been two years, but I'm doing pretty good. I started in October of 2009 and dropped about 170 lbs. over the next 14-15 months or so. Since then, I've been hovering within 2-3 pounds of that maintenance weight for the past 8-9 months. No special fad diets. Basically like shawmutt said, eating like a normal person + regular exercise. I learned how to count calories correctly, read food labels and understand serving sizes, and use exercise to make sure my calories out were more than my calories in. In fact, I've noticed that due to my exercise routine, I often take in more now than I did when I was actively losing. But then again, as I've become more fit, my activity level has gone up. The key for me was, and continues to be, balance.