Obesity, while notorious for shortening lifespan, can also lead to many chronic diseases, including infertility in women. Being obese has been the root cause in many women, negatively affecting ovulation, pregnancy rates, response to fertility treatment, and pregnancy outcome. Sources report that "Infertility in women who are overweight or obese is mainly attributed to ovulatory dysfunction that often leads to uneven menstrual cycles. In fact, many experiments have concluded that 30 to 47% of obese women tend to experience irregular menstrual cycles whose likelihood increases directly with the increase in weight". The good news is that even small amounts of weight loss can increase fertility.