Hi Christine,
About your subject question : all !
About your post : in my opinion, the most important thing is not your size breast but your healthy life.
Breast development need to wait at minimum 3 to 5 years.
All biological women see their size breast change when their weight change : when their weight decrease, size breast decrease too.
Also, I think it is more complicated : we are all different and your body react on his own way with a strong link with your mind. Mind have a strong influence on the body. I know people who eat a little and does not lost weight : because probably the problem is elsewhere.
Me, I try to eat the most organic food, but everything. I eliminate sugar, all prepared food (except what I prepare of course), all gmo food, alcohol (but a little good wine is healthy), smoking...
And I am living a happy life... the other key in my opinion. This, need more work than I could imagine and change a lot of thing in my life.
Take care of yourself,
Hannah