Does being overweight interfere with fertility?
Here's why: Extra fat cells don't just make your jeans feel tighter, they also produce a steady stream of the hormone estrogen. The result? "It's almost like being on a low-dose birth control pill," says Steven J. Ory, MD, immediate past president of the American Society for Reproductive Medicine and a reproductive endocrinologist in private practice in Margate, Florida. Low, constant levels of estrogen in turn suppress other hormones, most notably LH (luteinizing hormone) and FSH (follicle-stimulating hormone), which are needed to trigger ovulation.
Being overweight or obese also increases your risk of developing polycystic ovarian syndrome (PCOS), a complex condition where a hormone imbalance causes women to produce too much testosterone, a male hormone that can shut down ovulation at those high levels.