Thyroid hormones, stress hormones, insulin, growth hormones, and sex hormones all play a part in mammogenesis. During puberty your body releases a hormone which causes fat to accumulate in the breasts. Androgens such as testosterone can inhibit breast adiposity. Lower levels of Androgens and higher body fat percentage contribute to having larger breasts. Some women have this hormone for a short period of time, others may not make enough of this hormone or be sensitive enough to it, still others may be so thin they have no body fat for their breasts to store. Since breast functioning has nothing to do with breast size, breast development in different women varies considerably.
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