No single PCOS diet has been shown to beat the others. The 2023 International Evidence-based PCOS Guideline states that there is no one specific regimen with benefits over others, and recommends healthy eating for all women with PCOS, with a tailored calorie deficit when weight loss is the goal.
Within that, low glycemic index and lower-carbohydrate eating have the most trial support, though the trials are small and the results are mixed. Below you get what those studies found, a sample day, and the claims that go beyond the data.
Is there a best diet for PCOS?
The guideline recommends that healthy lifestyle behaviors, meaning healthy eating and physical activity, be offered to all women with PCOS to improve general health, quality of life, body composition and weight management (Teede et al., 2023, Fertil Steril).
If weight loss is the goal, it says a tailored energy deficit can be prescribed based on your energy needs, body weight and activity level. The 2018 version rested on evidence that was generally very low to low quality, so the wording is cautious.
An earlier systematic review of five dietary studies with 137 women found only subtle differences between diet types. Weight loss improved PCOS in most studies regardless of composition (Moran et al., 2013, J Acad Nutr Diet).
Does a low-GI diet help PCOS?
A low glycemic index (low-GI) diet is the best-studied option. In a trial of 96 overweight or obese women with PCOS, those on a low-GI diet improved insulin sensitivity more than those on a macronutrient-matched conventional healthy diet (Marsh et al., 2010, Am J Clin Nutr).
Among completers, 95% of women on the low-GI diet showed improved menstrual cyclicity, compared with 63% on the conventional diet (P = 0.03). Insulin sensitivity improved more in women who also took metformin.
The weak point is attrition. Forty-nine percent of participants dropped out of both groups, so those results come from women who stuck with the plan.
Do low-carb diets work for PCOS?
Possibly, for reproductive outcomes. A meta-analysis of 20 randomized trials with 1,113 participants found that diet was linked to better clinical pregnancy, ovulation and menstrual regularity rates, a lower miscarriage rate, higher SHBG and lower free androgen index (Shang et al., 2021, Front Endocrinol).
Subgroup analyses suggested low-carbohydrate diets did best for reproductive outcomes, while calorie restriction was critical for easing hyperandrogenism. Longer interventions produced larger improvements.
The Moran review found greater reductions in insulin resistance with low-carbohydrate or low-GI diets, but the diets differed too much to pool the data.
| Source | Design | Main finding |
|---|---|---|
| Teede 2023 | International guideline | No one regimen beats others; healthy eating for all; tailored energy deficit for weight loss |
| Moran 2013 | Systematic review, 5 studies, 137 women | Subtle differences by diet; weight loss helped regardless of composition |
| Marsh 2010 | Randomized trial, 96 women | Low-GI improved insulin sensitivity and menstrual cyclicity among completers; 49% attrition |
| Shang 2021 | Meta-analysis, 20 trials, 1,113 participants | Diet improved fertility and androgen outcomes; low-carb best for reproductive outcomes in subgroups |
What does a PCOS-friendly day of eating look like?
None of the studies above tested this exact menu. It is one way to apply the low-GI, higher-fiber pattern the trials used, built around whole foods, protein and fiber.
Adjust portions to your energy needs. If weight loss is your goal, the guideline says to tailor any energy deficit to your body weight and activity level, ideally with a registered dietitian.
| Meal | Example | Why it fits |
|---|---|---|
| Breakfast | Plain Greek yogurt with berries and chopped nuts | Protein with fiber instead of refined cereal |
| Lunch | Lentil and vegetable soup with a side salad | Legumes add fiber and protein |
| Snack | Apple slices with peanut butter | Fruit with fat and protein |
| Dinner | Baked salmon, quinoa and roasted broccoli | Whole grain, vegetables and protein |
For more on how hormones and insulin interact in different PCOS types, see our guide to lean PCOS versus insulin-resistant PCOS.
How do you make a PCOS diet stick?
Adherence is the real bottleneck. A systematic review of 68 papers on lifestyle change in PCOS found that people with PCOS and clinicians alike viewed health professional education on lifestyle management as inadequate (McGowan et al., 2025, Obes Rev).
Advice delivered by a multidisciplinary team that includes a dietitian was identified as a key component for change. Everyone in the review agreed that advice should be individualized and specific to PCOS.
People with PCOS also reported that lifestyle care was overly focused on weight loss and fertility, regardless of their own goals. Weight stigma affected people in larger and smaller bodies, lowering the quality of care. Ask for a plan built around your goals, not just the scale.
Which PCOS diet claims go beyond the evidence?
Any claim that one named plan, whether keto, anti-inflammatory or gluten-free, is the PCOS cure runs against the guideline, which found no single regimen superior.
Supplement claims are also ahead of the data. The guideline says specific types, doses or combinations of inositol cannot currently be recommended in adults and adolescents with PCOS because of a lack of quality evidence, and that metformin has greater efficacy than inositol for metabolic features.
Medication is a separate conversation. Our guide to GLP-1 drugs for PCOS covers that option, and it still requires a prescriber.
Who should be careful with a PCOS diet?
Be cautious with any restrictive plan if you have a history of disordered eating. A meta-analysis of 20 studies with 28,922 women with PCOS and 258,619 controls found higher odds of any eating disorder in PCOS (odds ratio 1.53) (Cooney et al., 2024, J Clin Endocrinol Metab).
Bulimia nervosa and binge eating disorder were more likely, anorexia nervosa was not, in the same analysis.
The authors say the risk applies regardless of weight and should be considered during lifestyle counseling. If counting, cutting or restricting food starts to feel compulsive, tell your clinician.
Weight-focused advice may not fit you if you are not above a healthy weight, since the Moran review’s weight-loss recommendation is aimed at overweight women. See the lean PCOS guide above for that case.
Talk to your clinician or a registered dietitian before cutting carbohydrates if you use insulin or other glucose-lowering medicines, if you are trying to conceive or pregnant, or if you have diabetes, kidney disease or another condition that changes your nutrition needs.
The video below, from Cleveland Clinic, features ob/gyn Kathryn Goebel on how insulin and diet relate to PCOS, including meal planning and food journaling.
Food journaling is useful for noticing patterns, but if it turns into rigid tracking, stop and speak to your care team.
Frequently asked questions
What is the best diet for PCOS?
The 2023 international guideline found no single regimen with benefits over others. It recommends healthy eating and physical activity for all women with PCOS. If weight loss is the goal, it suggests a tailored energy deficit. A registered dietitian can adapt this to your preferences and health conditions.
Should you avoid carbohydrates with PCOS?
You do not need to avoid them entirely. A 2021 meta-analysis found low-carbohydrate diets did best for reproductive outcomes in subgroup analyses, and a 2010 trial found a low-GI diet improved insulin sensitivity. Check with your clinician first if you use glucose-lowering medicines or have diabetes.
Can diet alone treat PCOS?
Diet is a first-line part of management, but it is not the only part. The guideline also covers medication, psychological care and fertility treatment. Metformin is recommended primarily for metabolic features. Diet changes can improve symptoms for some women, but they will not cure the condition.
Do you have to lose weight to improve PCOS?
Not always. Moran’s review found weight loss improved PCOS presentation in most studies, and recommended targeting it in overweight women. The guideline also supports weight maintenance and preventing weight gain. Women with PCOS who are not overweight should focus on healthy eating, activity and their clinician’s advice.
Does inositol work for PCOS?
Not enough evidence yet. The 2023 guideline says specific types, doses or combinations of inositol cannot currently be recommended in adults and adolescents with PCOS because of a lack of quality evidence. Metformin has greater efficacy for metabolic features. Ask your clinician before starting any supplement.
Sources
- Teede HJ, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Fertil Steril. 2023. PubMed. Full text: PMC10505534.
- Moran LJ, et al. Dietary composition in the treatment of polycystic ovary syndrome: a systematic review to inform evidence-based guidelines. J Acad Nutr Diet. 2013. PubMed.
- Marsh KA, Steinbeck KS, Atkinson FS, Petocz P, Brand-Miller JC. Effect of a low glycemic index compared with a conventional healthy diet on polycystic ovary syndrome. Am J Clin Nutr. 2010. PubMed.
- Shang Y, Zhou H, He R, Lu W. Dietary modification for reproductive health in women with polycystic ovary syndrome: a systematic review and meta-analysis. Front Endocrinol. 2021. PubMed.
- McGowan M, et al. Understanding barriers and facilitators to lifestyle management in people with polycystic ovary syndrome: a mixed method systematic review. Obes Rev. 2025. PubMed.
- Cooney LG, et al. Increased prevalence of binge eating disorder and bulimia nervosa in women with polycystic ovary syndrome: a systematic review and meta-analysis. J Clin Endocrinol Metab. 2024. PubMed.
