DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Drug abuse in sport. Amateur weight lifter affected by gynaecomastia, the enlargement of one or both breast. It was caused by an excessive intake of anabolic steroid hormones which changed the balance in the body between male (androgens) and female (oestrogens) sex hormones. Anabolic steroid hormones are used by athletes to stimulate muscle and bone growth.
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