Reproductive system
A prime example of what happens to the reproductive system in anorexic patients is that girls or women stop having their period. This is because the body knows that they can’t handle supporting a healthy baby. The severely low intake of calories sends a signal to the hypothalamus, a small portion of the brain that controls many other endocrine glands. Because the body doesn't have enough fat to produce estrogen in females, the development of amenorrhea (cessation of periods) and infertility, and testosterone in men, resulting in low sex drive, may occur. This signal leads to less hormones coming from the pituitary gland in the brain, which would normally cause a woman to ovulate and get her period each month.
Men with anorexia also can have problems with their reproductive system, although it may not be as obvious as in women. These men will commonly have a low testosterone level (which is also because the body is shutting down reproduction), and they may lose interest in sex and have trouble having an erection (sexual inactivity).
More surprisingly, a woman may be unable to conceive because her reproductive system cannot function properly.
http://empower.aace.com/taxonomy/term/165
http://www.eatingproblems.org/epseffect.html
http://www.sugarnancy.com/articles/art0001.pdf
Men with anorexia also can have problems with their reproductive system, although it may not be as obvious as in women. These men will commonly have a low testosterone level (which is also because the body is shutting down reproduction), and they may lose interest in sex and have trouble having an erection (sexual inactivity).
More surprisingly, a woman may be unable to conceive because her reproductive system cannot function properly.
http://empower.aace.com/taxonomy/term/165
http://www.eatingproblems.org/epseffect.html
http://www.sugarnancy.com/articles/art0001.pdf