Nobody ever mentioned Graves to me, so I know nothing about it. If I had lost 40 pounds when I had prediabetes, I would not have had any signs of prediabetes anymore. As it is, I lost 20 pounds when I first had prediabetes and kept it at nigh normal for a few years until it bumped up a little the last couple of years. No, having no thyroid doesn't seem to affect my weight, just eating and not exercising makes the difference. Not having stress in my life makes a huge difference in eating. I never connected thyroid problems and diabetes. I will study more. Dorisena