Symptoms of Polycystic Ovarian Syndrome Ameliorated by Keto-Adaptation Pilot

Inclusion Criteria: * Female participants aged 18-40 years. * Clinical diagnosis of Polycystic Ovary Syndrome (PCOS) according to Rotterdam criteria (presence of at least two of the following: oligo- or anovulation, clinical or biochemical signs of hyperandrogenism, and/or polycystic ovaries on ultrasound). * Willingness and ability to comply with all study procedures, including fasting (\>10 hours; water only), avoidance of alcohol (\>24 hours), and abstaining from exercise (\>24 hours) prior to each test visit. * Willing to maintain current diet, exercise, medication, and supplement habits throughout the study. * Body mass index (BMI) ≥18 kg/m². * Access to a smartphone, computer, or tablet for digital tracking and study communication. Exclusion Criteria: * Current adherence to a low-carbohydrate diet (\<30% of total energy from carbohydrates). * Non-PCOS etiologies of anovulation (e.g., menopause, oophorectomy, or other reproductive disorders). * History of type 1 diabetes or uncontrolled type 2 diabetes. * Weight loss ≥10% of body weight within the previous 6 months. * Pregnancy or breastfeeding. * Use of hormonal contraception or medications known to alter reproductive hormones within 3 months prior to enrollment. * Active eating disorder or medical condition that could interfere with dietary intervention. * Any condition that, in the opinion of the Investigator, could interfere with participation, data integrity, or safety.