The Study
Dietary composition in restoring reproductive and metabolic physiology in overweight women with polycystic ovary syndrome.
This study gave two groups of women different diets and saw what happened after they lost weight. It shows that losing weight helped them feel better, but we can't say for sure if one diet was better than the other because the differences were tiny.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Women with PCOS who were overweight lost weight by eating fewer calories, either with more protein or less protein. Both diets helped them get regular periods and improved their blood sugar and cholesterol — but the low-protein diet made some hormone problems worse.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 547 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — losing weight helped fix menstrual and metabolic problems, but eating too little protein might make hormone imbalances worse even after weight loss.
- 2Women lost 7.5% of their body weight and 12.5% of belly fat.
- 3Their periods improved.
- 4HDL (good cholesterol) dropped 10% on the low-protein diet.
- 5Male hormone levels rose 44% on the low-protein diet during maintenance.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of clinical endocrinology and metabolism
Year
2003
Authors
Lisa J. Moran, Lisa J. Moran, M. Noakes, P. Clifton, L. Tomlinson, R. Norman
Related Content
Claims (4)
Overweight women with polycystic ovary syndrome who followed a calorie-restricted diet for 12 weeks and maintained their weight for 4 weeks lost 7.5% of their body weight and 12.5% of abdominal fat, and experienced improved menstrual regularity, better lipid levels, and reduced insulin resistance, regardless of whether the diet was high-protein or low-protein.
In overweight women with polycystic ovary syndrome, losing weight is linked to more regular menstrual cycles, and this improvement is tied to lower levels of insulin resistance and fasting insulin.
In overweight women with polycystic ovary syndrome, a diet with 15% protein during weight loss reduces high-density lipoprotein cholesterol by 10%, and during weight maintenance, it increases the free androgen index by 44%.
In overweight women with polycystic ovary syndrome, losing weight improves heart and reproductive health by reducing insulin resistance, whether the diet is high-protein or low-protein.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.