Does bulimia ever have an effect on your breasts?

BULEMIA BREASTS. Breasts are impacted by Estradiol [e2] ovarian estrogen, estrone [e1 or fat estrogen, progesterone, 16-oh-fat estrogen which may increase cancer and 4-oh-estrone. Some of these can be directly measured. Most pms or pdd can be helped by natural progesterone. If you are very thin, you may need a patch of estrogen day 1- ? Since you need some estrogen to make a uterus lining.
Absolutely. If the bulimia is severe enough to cause hypocaloric malnutrition, fat tissue will diminish rapidly. Breasts are mostly fat tissue, so they will diminish in proportion the malnutrition.