Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease in the United States. 1 Emerging US data highlight the largest increase in NAFLD incidence among adults younger than 40 years. 2 Nonalcoholic steatohepatitis (NASH) is the most rapidly growing indication for liver transplantation (LT) in young adults, and now is the most common indication for LT in women. 3,4 Thus, the public health implications of NAFLD/ NASH in women of reproductive age are vast. The clinical management of young women must therefore consider female-specific risk factors for NAFLD, as well as the implications of NAFLD on reproductive health.
rePrODUCTive risK FaCTOrs anD naFlD in wOMen
Polycystic Ovary SyndromePolycystic ovary syndrome (PCOS) is now recognized by the American Association for the Study of Liver Diseases as a risk factor for NAFLD, 5 with 40% to 55% of women with PCOS having imaging-confirmed NAFLD. 6,7 PCOS is a common disease, affecting ~10% of women of reproductive age. Typical features of PCOS include insulin resistance, irregular menstrual cycles, polycystic ovaries, and laboratory or clinical signs of elevated androgen levels (i.e., testosterone). Approximately 80% of insulin-resistant women with PCOS are either overweight or obese, 8 and PCOS is further associated with more rapid progression from insulin resistance to frank diabetes. 9 Elevated liver enzymes are reported in approximately one-third of women with PCOS, which are higher than the values in age-and body mass index (BMI)-matched controls. 10 Cytokeratin 18 levels, a biomarker of NASH, are also higher in women with PCOS, independent of age and BMI. 11 Less data are available on NASH histology and PCOS. A recent study of biopsy-confirmed NAFLD in women of reproductive age found a similar