Strictgirl hit the nail on the head. You must burn more calories than you consume in order to lose weight. I finally started losing weight again when I starting watching calories. I had been probably consuming 2,500 a day (since fatty meat and cheese are so low in carbs, I thought they were freebies!) and cut it down to 1700. At 1700 I still felt full, as long as I made good choices, and my body had all it needed to function properly, but I wasn't gourging myself. It really forced me to learn portion control.