Wrong eating and lifestyle habits, genetic and environmental factors, a functional variation of endocrine glands, intake of certain drugs, and age are proved to be contributing to obesity. Whether obesity affects fertility is still a complex and difficult issue to fathom, but scientific evidence shows that abdominal phenotype (women with abdominal obesity) is associated with several reproductive disturbances. Research findings prove that Obesity adversely affects almost every system of the body, has a strong connection with menstrual irregularities, and the reproductive system is not an exception. Obesity increases the risk of Polycystic Ovarian Syndrome (PCOS) in women, which causes infertility, while obese women who do not have PCOS also suffer infertility problems with some other biological changes that occur in the body due to obesity. Recent researches done on infertile men revealed that obesity has an adverse effect on male fertility as well, and found a direct link between obesity and the overall quality of a man’s sperm.Tackling obesity is possible by changing our eating habits and resorting to regular exercise. In special cases, medication and even surgical intervention may be adopted. Obesity is primarily a product of our own wrong habits and lifestyle, which primarily obstructs reproductive capacity. When our habit is the main obstacle on the way to the personal achievement of reproduction, the basic biological necessity and fulfillment of a person’s aspiration, it is high time for retrospection to overcome the hindrance with individual initiative and professional guidance.Obesity is a major medical problem today, and it has grown to epidemic proportions in the US and other developed countries. Obese persons can easily be spotted from their general physical appearance, and scientifically the cases are identified on the basis of an individual’s Body Mass Index.