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Why Does PCOS Cause Insulin Resistance? A Simple Guide Polycystic Ovary Syndrome (PCOS) affects millions of women worldwide. Beyond irregular periods and ovarian cysts, PCOS also impacts how your body uses insulin—the hormone that helps turn sugar from food into energy. Understanding insulin resistance in PCOS can help you manage symptoms better and improve your health. What is Insulin Resistance? Insulin is like a key that opens the door for sugar to enter your body’s cells (especially muscle and fat cells). In insulin resistance, the “locks” on these cells don’t open properly when insulin tries to do its job. As a result, sugar stays in the bloodstream instead of being absorbed for energy. To compensate, your pancreas produces more insulin, causing high insulin levels in the blood. How Does PCOS Cause Insulin Resistance? In PCOS, the insulin “lock” (called the insulin receptor) is chemically altered, mainly through a process called serine phosphorylation. This makes it harder for ins...