I had a heart attack two years ago. I'm on medication including cholesterol lowering, and for a slow thyroid just to name a few. I eat lots of fiber high foods and watch calories, walk 4 miles a day and do resistance training 3 to 4 times a week. I am worried because I can't lose weight and I still have a lot of fat around my middle despite all that I do. Could the meds that I'm taking be interfering with my lack of losing.