How old are you? Are you male or female? If you dont mind. As
for the weight lifting not burning
fat.....wrong. When you build muscle, muscle burns fat. Once you get those muscles moving, you burn calories all day. Probably not to the extent that you are losing it, but then that is why I asked your sex. Trust me, makes a difference. Does your Dr seem concerned about the weight loss? Do you weight yourself at the same time and in the same types of clothing, naked is best.