News | Can a ketogenic diet help with polycystic ovary syndrome?
A systematic review and meta-analysis published in Clinical Nutrition suggests that a ketogenic diet (KD) may produce short-term improvements in weight, insulin resistance, and some hormone levels in women with polycystic ovary syndrome (PCOS). However, studies varied substantially, and high-quality evidence on long-term efficacy and safety remains lacking.
PCOS is the most common endocrine disorder in women of reproductive age. It is often associated with ovulatory dysfunction, hyperandrogenism, infertility, obesity, and insulin resistance, and it increases the risk of cardiovascular disease, type 2 diabetes, and some cancers. Lifestyle intervention and weight management are considered foundational treatments.
A ketogenic diet is high in fat, moderate in protein, and very low in carbohydrates, inducing nutritional ketosis. Previous studies suggest that it can reduce post-meal insulin secretion, improve insulin sensitivity, and promote weight and fat loss. Because PCOS and type 2 diabetes share mechanisms of insulin resistance, the diet may have therapeutic value, although whether benefits arise from carbohydrate restriction itself or mainly from weight loss remains disputed.
The team searched Web of Science, PubMed, Scopus, Cochrane Central, ClinicalTrials.gov, and other databases for studies evaluating the effects of ketogenic diets on physical, metabolic, and endocrine outcomes in women with PCOS. Fifteen studies were included in the systematic review and 10 in the meta-analysis. They covered Europe, Asia, and the Americas, and participants had a mean body mass index (BMI) above 25 kg/m².
After a ketogenic diet, women with PCOS had significant reductions in BMI, weight, and waist circumference compared with baseline, although heterogeneity between studies was high and confidence intervals for some outcomes were wide. Total cholesterol, low-density lipoprotein cholesterol, and triglycerides fell significantly. High-density lipoprotein cholesterol tended to rise, but the change was not statistically significant.
Luteinizing hormone (LH) and testosterone levels decreased, while follicle-stimulating hormone (FSH) changed little. Measures of insulin resistance also improved, with significant reductions in HOMA-IR and fasting insulin. Effect sizes varied widely and appeared to depend on baseline metabolic status and the amount of weight lost.
Compared with other dietary interventions, ketogenic diets produced larger reductions in BMI, weight, and waist circumference, as well as lower total cholesterol and triglycerides. HDL and LDL cholesterol differed little between diets. Among hormone measures, LH decreased and FSH rose slightly, while testosterone did not differ significantly.
The included studies generally had small samples, short follow-up, and inadequate blinding; only a few randomized controlled trials had a low risk of bias. Overall certainty of evidence was rated "low" to "very low." Adverse-event reporting was inconsistent, and evidence on long-term adherence, sustainability, and safety was clearly insufficient.
The researchers conclude that a ketogenic diet may provide short-term metabolic and hormonal benefits for some women with PCOS who are overweight or obese. However, these improvements may largely result from weight loss and better insulin sensitivity and may not translate directly into long-term reproductive outcomes or fertility benefits. Until long-term, high-quality randomized trials are available, the role of ketogenic diets in PCOS management should remain cautious.
News | Can a ketogenic diet help with polycystic ovary syndrome?
News | Can a ketogenic diet help with polycystic ovary syndrome?
A systematic review and meta-analysis published in Clinical Nutrition suggests that a ketogenic diet (KD) may produce short-term improvements in weight, insulin resistance, and some hormone levels in women with polycystic ovary syndrome (PCOS). However, studies varied substantially, and high-quality evidence on long-term efficacy and safety remains lacking.
PCOS is the most common endocrine disorder in women of reproductive age. It is often associated with ovulatory dysfunction, hyperandrogenism, infertility, obesity, and insulin resistance, and it increases the risk of cardiovascular disease, type 2 diabetes, and some cancers. Lifestyle intervention and weight management are considered foundational treatments.
A ketogenic diet is high in fat, moderate in protein, and very low in carbohydrates, inducing nutritional ketosis. Previous studies suggest that it can reduce post-meal insulin secretion, improve insulin sensitivity, and promote weight and fat loss. Because PCOS and type 2 diabetes share mechanisms of insulin resistance, the diet may have therapeutic value, although whether benefits arise from carbohydrate restriction itself or mainly from weight loss remains disputed.
The team searched Web of Science, PubMed, Scopus, Cochrane Central, ClinicalTrials.gov, and other databases for studies evaluating the effects of ketogenic diets on physical, metabolic, and endocrine outcomes in women with PCOS. Fifteen studies were included in the systematic review and 10 in the meta-analysis. They covered Europe, Asia, and the Americas, and participants had a mean body mass index (BMI) above 25 kg/m².
After a ketogenic diet, women with PCOS had significant reductions in BMI, weight, and waist circumference compared with baseline, although heterogeneity between studies was high and confidence intervals for some outcomes were wide. Total cholesterol, low-density lipoprotein cholesterol, and triglycerides fell significantly. High-density lipoprotein cholesterol tended to rise, but the change was not statistically significant.
Luteinizing hormone (LH) and testosterone levels decreased, while follicle-stimulating hormone (FSH) changed little. Measures of insulin resistance also improved, with significant reductions in HOMA-IR and fasting insulin. Effect sizes varied widely and appeared to depend on baseline metabolic status and the amount of weight lost.
Compared with other dietary interventions, ketogenic diets produced larger reductions in BMI, weight, and waist circumference, as well as lower total cholesterol and triglycerides. HDL and LDL cholesterol differed little between diets. Among hormone measures, LH decreased and FSH rose slightly, while testosterone did not differ significantly.
The included studies generally had small samples, short follow-up, and inadequate blinding; only a few randomized controlled trials had a low risk of bias. Overall certainty of evidence was rated "low" to "very low." Adverse-event reporting was inconsistent, and evidence on long-term adherence, sustainability, and safety was clearly insufficient.
The researchers conclude that a ketogenic diet may provide short-term metabolic and hormonal benefits for some women with PCOS who are overweight or obese. However, these improvements may largely result from weight loss and better insulin sensitivity and may not translate directly into long-term reproductive outcomes or fertility benefits. Until long-term, high-quality randomized trials are available, the role of ketogenic diets in PCOS management should remain cautious.
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