Wow, 50lbs is a good chunk of weight to lose. Great job! You probably just need more of a fill. However, our bodies need time to adjust to each chunk of weight we lose. I, too, lose a bit and then stop for awhile, then I'm off to losing again. Are you getting hungry between meals? Are your portion sizes fairly generous? Are you exercising? How much water are you drinking? If you are doing your exercising, getting in your water, but are eating larger portions and getting hungry between meals, then I would call the doctor for a slight fill. Good luck!