I've lost 12 lbs since right after Thanksgiving. I just went to the doctor last week. He says that's a good rate; it's easier to keep it off by losing more slowly. My weight range - 252 ten years ago, got it down to 220. I slipped up to 230, then have been losing a little since - now 218. He suggested about 180 for my size and build for a male. I asked him what for a female and he never answered. At this appointment I gave him the word about the GID. He took it very calmly, but said that in 25 years, while he had several patients with gender issues ("conflicts" I believe he said), none had transitioned, so he may have lost track, which he does not do much. Of course he hasn't had me transition yet either, but he agreed with my therapists' choice of endo doc.
Anyway, I agree with him, and I guess your friend, that you may be fast-tracking the loss a bit, but the proof will be in keeping it off. I'm losing mine by following the advice from comedian Carl Hurley's doctor, "you need to stop having these intimate little dinners for two, when these's only you there!"
SusanKG