Could there be a medical reason besides thyroid problems for a SLOW metabolism?

My metabolism has always been extremely slow. I have been checked many times throughout my life and do not have a thyroid problem. I am three months out from lap RNY and have lost about 65 pounds. My surgeon is extremely disappointed in my weight loss given my high starting weight. I have not cheated, no snacking, etc. I am eating three meals a day, protein first, VERY little carbs if at all, 75 ounces of water a day, one to two Real Meals protein drinks a day, exercising one hour every day on my recumbent Lifecycle bike. Yes, I work up a definite sweat. My calories stay between 650-850 depending on exactly what I eat. I have read through the metabolism questions in the library and I do not see anything that specifically talks about other medical problems that may contribute to slow weight loss with the exception of thyroid problems and I cannot help but wonder if there is another reason for my slow loss. Thanks in advance for any responses!! :-)

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