Numerous studies report that women who have excess weight or obesity tend to have a more difficult time becoming pregnant than normal-weight women. Moreover, once pregnancy occurs, women with obesity have a higher rate of pregnancy loss.
There are a significant number of overweight and obese females who suffer infertility. This could be a consequence of irregular periods and frequently anovular (non-ovulatory) menstrual cycles. A large percentage of those infertile patients have Polycystic Ovarian Syndrome (PCOS), a disorder often associated with obesity, chronic anovulation, and menstrual irregularity.