I have only had RNY surgery once, but I have several metabolic challenges that result in me being a VERY SLOW LOSER no matter how 'on point' my eating/exercising/etc. is. I was very concerned about my very slow loss, especially as this is the only time I've had surgery.
In the first 2 weeks I was under 200 calories a day and the next 4+ weeks, I was under 400-450 a day so the 'math' did not add up. I was told the exact same thing by my doctor and his nutritionist - that after I had healed more, the weight loss would pick up SOME. It did, but I am still a slow loser.
HOWEVER, now I am over 3 months out and those 'small numbers' that dismayed me are all adding up. I think I read somewhere, and hopefully one of the veterans can correct me if I have this wrong, but when comparing amount of weight lost at about 2 years out, those who lost 'fast' and those who lost 'slow'...ended up with very comparable amounts of weight lost by that time (assuming all things are equal - like the slow losers didn't give up out of frustration - they continued to work and stick to their plan and exercised just as much if not more as others).