Tehran University of Medical Sciences Journal of Family and Reproductive Health 1735-8949 2 3 2008 09 15 115 122 Safaa Al-Hasani Department of Obstetrics and Gynecology, University of Schleswig-Holstein, Lübeck, Germany Khaled Zohni Medical Sciences Division, Reproduction unit, National Research Center, Egypt 2015 10 04 Being either underweight or overweight can affect a woman's fertility. Irregular menstrual cycles, reduced spontaneous and assisted fertility and an increased risk of miscarriage are risks associated with obesity that are often overlooked. Excessive weight and central distribution of body fat are both related to an increased risk of normogonadotrophic anovulation. Weight loss can re-establish ovulation in obese anovulatory patients or improve their response to ovulation induction. However, even a small amount of weight loss (5%) may improve fertility. Men who are overweight or obese have significantly lower sperm counts than men of normal weight. https://jfrh.tums.ac.ir/index.php/jfrh/article/view/44 https://jfrh.tums.ac.ir/index.php/jfrh/article/download/44/44