Obesity is a main health problem, that affects people all over the world. According to recent articles, obese patients should be denied any therapy to aim improving ovulation rates and achieving pregnancy until their BMI is reduced. We believe that this approach does not solve the issue, but rather exacerbates the maternal and perinatal complications linked to fertility clinics. Obesity independent of polycystic ovary syndrome (PCOS) is related with anovulation, and a weight loss alone is an effective treatment for inducing ovulation in both obese women with or not PCOS. As a result, weight-loss lifestyle programs should be considered an ovulation induction therapy, with due consideration for a possible pregnancy in an obese woman. Obesity has been linked to menstrual irregularities and infertility, Despite the fact that a critical mass of adipose tissue is needed for development female reproductive function. The severity of fat tissue distribution and obesity are important factors that affect the female reproductive system. The mechanisms of pathogenetic that link them aren't well understood. Insulin resistance and hyperinsulinemia are common in obese, especially those women with upper obesity of body, as are hyperandrogenemia, increased peripheral aromatization of androgens to oestrogens, altered secretion of gonadotrophin, and reduced (SHBG), decreased growth hormone (GH) , insulin like growth factor binding proteins (IGFBPs), elevated level of leptin and changed neuroregulation of the hypothalamic‐pituitary‐gonadal axis.