You don't say how far out you are. But I am 7 months out from surgery, and I also seem to be able to eat whatever I want. I can't eat the same large quantities, but I can graze all day on sweets (unfortunately I've tried and know this for sure) with no ill-effects. My appetite has also returned, and if I'm not careful I will overeat. I've been at a plateau for about 5 weeks, and I do beat myself up a little, especially when I see others on here posting such great success. I try to keep in mind that everyone hits rough spots, everyone's journey is different, and most importantly - it's a marathon, not a sprint. I look at how far I've already come, and I re-commit. With the weather getting nice, I've started adding more walking time, and definitely drinking more liquids. That seems to help with the snacking, sugar-free popscicles are probably going to become my best friends in the next few months. The scale was down a few pounds this morning. Keep at it - chances are if you look at your starting weight, compared with today - you already are "successful".

I had the RNY specifically to help me avoid sweets and fatty items due to the much feared dumping syndrome. Sadly, I can really eat most of what I want, and at quantities above what I was told I would be able to eat. However, it hasn't really stopped me from getting to where I want to be. Like Tristaan said, you didn't post any details on how far post-surgery you are, however if you are beyond six months then yes, the appetite will have returned, and the weight will be harder to drop. I don't want to sound too harsh, but this is the point where you need to start working at it. You need to make sure to maintain portion control, and try not to graze or eat lots of snacks. Weight your food out, track your intake. Don't worry about the amount of calories MFP gives you, as they don't match what we need depending on where you are in your journey. Most importantly, make sure you get enough PROTEIN! I average about 130 to 150 gm a day, and that's honestly below where I want to be. I've found that on the weeks where I make protein an absolutely priority I do better.

We all hit stalls and plateaus. Sometimes changing up your routine for a few days can jumpstart it. See if you can do a different exercise program for a few days, or try a few different foods. If we do the same thing over, and over, our body adjusts to it. Just concentrate on getting different movements in, maybe doing strength training (it's important to build muscle for your base metabolism), and work on getting protein and you should see the scale move within a week or two. Again, I'm assuming that you are less than a year post surgery. If you are move than a year post, then more than likely you've lost most the weight that you are going to lose, and should work on toning your body up and losing body fat instead of weight. My weight has been consistent for months, however I've lost about 5% body fat in the last 6 months.

Track all your food intake in MFP (even the snacks) and get a FitBot to track your calorie burn. Link the two together and you will actually SEE the calories in and out. This will help you keep on program.

I could've created this post myself a week ago. I'm six months out and have lost 75lbs. Somewhere along the way, I slowly let snacking, carbs, and just generally unhealthy choices start to sneak back into my routine after a seemingly endless plateau. Of course those poor choices did nothing to help the plateau. About a week ago, the dietician at my clinic sent out a mass email that seemed like it was targeted just towards me. It contained information about a reboot diet. Basically, I'm drinking protein shakes for my meals, eating two protein bars as snacks and drinking my 64 oz of water. I'm supposed to do this for two weeks. I'm already seeing results and feel like I'm breaking the addictions that had started back up. I visited the doc today. He reminded me that this a life long struggle. Not just one that ends after the surgery is over or even after the weight is off. It has to be one conscious decision after another. Instead of telling yourself you "can't" have that, tell yourself you choose not to eat it. It involves reframing the mind.

Having said that, don't give up! This is your life (and my life) and we deserve to be healthy and happy.