I have Graves and also very low calcium, I put on three stone over the last year, I have read different forums and information on how to loose weight, most of them all said the same that you will be lucky to loose any weight no matter what diet to be on.The comments made me feel very depressed, I felt whats the point in trying to loose weight if all these people say its hopeless. Then ten days ago I decided to give myself a kick up the bum and make an effort, I switched to having a healthy diet and excercise more, not by joining a fancy gym but by walking more, which I find difficult due to my muscles being sore, I have enjoyed shopping for healthy food making my own meals from fresh products and walking for 30 minutes a day. Yesterday I bought an exercise bike which I am going to use while watching TV!. The good news is I have lost almost 6lbs. So please don't read all the negative statements on forums and think why should I bother going on a diet or eating healthily, be positive and think you can do this. I also feel better, not so tired and the muscles in my legs are not as sore as they were.