Men and women are affected by obesity alike and infertility is rampant among the obese. When obesity occurs, multiple factors come into play affecting the reproductive capacity of men and women. In this article we are attempting to give a broad view of those factors and establish in clear terms that men and women who are obese should always aim to keep their body weight under control to maintain good fertility. Understanding HPG Axis HPG stands for Hypothalamic-Pituitary-Gonadal Axis. Hypothalamus, pituitary and gonad are endocrine glands that produce ranges of hormones that are required to regulate the various bodily functions. Though these glands are present at various places in the body anatomically, they act in sync to such an extent that they are referred as HPG axis. HPG axis and the production of hormones thereof controls such body functions like reproduction, immunity, and others. The interesting thing about this axis is, one hormone controls the production of other and...