I've been many different weights throughout my life I'm highlighting the points that my weight started to turn the other way. Oh I'm 5'7 for reference.
11stn (Male) -Normal mostly muscle-
13stn (Male) -Fat-
10stn (Male*start of transition*) -Normal-
10.5stn (Female) -Normal slightly chubby-
8.5stn (Female) -Borderline anorexic-
9stn (Female*Current*) -Slender-
I dropped from 13stone to 10stone pre-transition when I became a vegetarian I gave up the vegetarianism when I started transition and got cravings for fleshy things although I don't eat a alot of meat I do treat myself from time to time. My mum kicked up a fuss when I lost 3 stone in 6 months but seriously I WAS overweight and loosing those 3stone made me feel SO much healthier.
As I started hormones my weight increased slightly and that extra half stone did generally goto the right places however mostly to my ass and hips not alot went to my boobs tho. *sigh* however I still had some male fat from before lingering around that didn't move. (mini-pot belly and visceral fat)
My weight remained stable for nearly a year I then got depressed and fell into some dangerous anorexic like habits, within a couple of months my weight nose dived. My feminine ass and hips vanished and my boobs were reduced to nothing but big nipples on a ribcage... I didn't look particularly masculine I looked more like a child, I definitely looked less feminine than I did. My waist looked good everything else however looked bony. it really exaggerates your height even if your not incredibly tall for a female like me That's when people start referred to me as "That lanky chick" or "The Scrawny girl" I had a boyfriend during this time who laughed at my chest when he saw me naked referring to them as "anti-boobs" comments like that did hurt.
Mercifully I have managed to pull up and wriggle away before that demon gripped me too hard and I've gained weight since then. I would note all the weight I've gained since then has gone to the right places, my boobs are as big as they were when I was 10.5 (Small but present) stone and I still have a trim waist and belly the weight I've gained has gone to my hips and bum again but without any of the male bits I had before.
I think that estrogen makes new fat cells goto feminine places but doesn't shift "male" fat cells itself. Of course the conclusive test for me would be to gain another stone back upto 10stone and see if it gives me a cracking set of tits or gives me a minipot belly again.
Nahh actually I think I'm fine how I am.
So yeah in theory loose alot of weight then gain it back when on HRT... easier said than done, of course... Eating disorders are like deadly black holes or rip-tides, You think your okay and your not as bad as the 6stn girls on jerry springer so you can go alittle further, but when you turn around you realize how hard it is to pull away, I didn't even fall that far but I did *really* fell it's pull on me.