I just got blood work results from a physical exam, and learned that I have an under-active thyroid, which causes sluggishness, no energy, and - guess what - weight gain! I've wondered over the last year or so why I seem to feel drained all day - to the point where I come home from work and can barely get up enough energy to make dinner for the kids, let along take the fast walks I used to do. I will begin taking meds for this tomorrow, and they will increase my metabolism, making most body systems work more effectively. I'm really hoping that I'll see faster weight loss, as I have been good and sticking to a very healthy diet since early January. Has anyone else had this problem, and then get treated for it? I would love to hear stories of what to expect.