Weight Cycling on Hyperandrogenemia and Insulin Resistance in Polycystic Ovary Syndrome

This study is a single-center, prospective cohort study that enrolled PCOS patients after screening. The patients were categorized into two groups based on their BMI: a normal weight group (18.5 kg/m2 ≤ BMI < 24 kg/m2) with a sample size of 45 and an overweight/obese group (BMI ≥ 24 kg/m2) with a sample size of 380, totaling 425 cases.

For the normal weight PCOS patients, interventions included control of total energy intake, adjustment of dietary structure, exercise, and behavioral intervention to prevent weight gain over a follow-up period of three months. If weight gain occurred during the follow-up period, these patients were transferred to the overweight/obese group for intensified intervention.

The overweight/obese PCOS patients received intensive intervention in accordance with high-protein diet adaptation criteria. This involved high-protein diets combined with exercise and behavioral intervention for weight reduction. After three months of follow-up, if they achieved their weight-loss goal, they transitioned to a low-energy diet and exercise intervention program to maintain their weight. If the goal was not met after three months, they continued with the high-protein weight-loss program.

The study compared differences in improvement in indicators such as insulin resistance (IR), blood androgen levels, inflammatory factors among different degrees of weight loss (<2%, 2% ≤weight loss <5%, 5%≤weight loss<10%, ≥10%), analyzing potential mechanisms.

For individuals experiencing weight cycling, differences in IR levels before and after rebounding from body mass were compared alongside changes in androgen levels and other metabolic indicators. This aimed to explore the impact of body mass cycling on clinical indicators while analyzing potential causes.

Ancillary/Nested Sub-study (12-week Precision Nutrition Trial):

A subset of cohort participants meeting criteria for PCOS with insulin resistance will enter a 12-week dietary intervention sub-study. Participants will be allocated in a 1:1 ratio to: (1) a phenotype-guided precision dietary prescription tailored to the individual's insulin-resistance metabolic subtype; or (2) a standard low-energy diet based on current Chinese clinical guidelines for overweight/obesity medical nutrition therapy. Both groups receive standardized lifestyle counseling and follow-up. Study visits occur at baseline and week 12. This nested sub-study is designed to test whether subtype-matched dietary prescriptions yield greater improvements in insulin resistance and metabolic risk than a uniform guideline diet, while remaining integrated within the parent WHIP cohort.

Inclusion criteria

• Women aged 18-45 years in the reproductive period;
• Women who have previously met the Rotterdam diagnostic criteria (at least 2 of the following 3 criteria have been confirmed, and have been diagnosed with PCOS): 1) Oligomenorrhea and/or anovulation; 2) clinical and/or biochemical evidence of hyperandrogenism; 3) ultrasound showing the presence of unilateral or bilateral polycystic ovaries;
• Inclusion of 50 women in the normal weight group: 18.5 kg/m² ≤ BMI < 24 kg/m²; Inclusion of 400 women in the overweight/obese group: BMI ≥ 24 kg/m²;
• Voluntarily participate in the intervention and sign an informed consent form.

Exclusion criteria

• Currently pregnant or lactating, or have had a recent (within 6 months) plan for pregnancy;
• Currently using known prescription weight loss medications (such as GLP-1RA, orlistat, topiramate, etc.);
• History of weight loss surgery;
• History of severe cardiovascular or cerebrovascular diseases; severe liver or kidney dysfunction (ALT > 3 times the upper limit of normal, or creatinine > 1.5 times the upper limit of normal); chronic or active gastrointestinal inflammatory diseases; severe systemic diseases; active malignant tumors;
• Secondary obesity: including hypothalamic or pituitary obesity, obesity secondary to glucocorticoid use, hypogonadism-induced obesity, etc.;
• Known history of serious endocrine system diseases;
• Poor compliance with planned dietary interventions (psychiatric disorders such as binge eating disorder, anorexia nervosa, severe anxiety/depression);
• Unable to follow up on time or deemed non-cooperative by the investigator.