Stimulation of ovulation is a very important step in the whole process of infertility treatment . The primary objective is to obtain one or more normal oocytes. The effects of treatment may be dependent on many different factors. The most frequently mentioned , and whose importance for the results of stimulation is still under discussion , please obesity and age. Obesity can be a symptom of an existing endocrinopathies ( PCO syndrome ) or inadequate nutrition. In obese women are more often observed ovulation disorders associated with the secretion , transport and metabolism of hormones.