If you have a pituitory tumor that has been radiated because of an unseccessful surgery for removal, am taking synthroid now, would the natural hormones work better to help me lose some weight. I am 53, very active, play USTA 4.5 league tennis and WTTA tennis, walk 3 miles a day, and strenght train exersice 3 times a wk. I just keep gaining weight and diets just don't seem to work for me.