Keto and Fertility: What the Research Shows

The relationship between diet and fertility is increasingly scrutinised, with the ketogenic diet emerging as a potential modulator of reproductive health. By altering macronutrient intake, keto may influence hormonal balance—particularly in conditions like polycystic ovary syndrome (PCOS), which affects 1 in 10 UK women according to the NHS.

Hormonal Regulation on Keto

Carbohydrate restriction appears to lower insulin levels, which in turn may reduce excess androgen production. A 2005 pilot study by Mavropoulos et al. found that after 24 weeks on a ketogenic diet, women with PCOS showed significant improvements in fasting insulin (-54%) and free testosterone (-22%). These markers are critical for ovulation and menstrual regularity.

PCOS Management

With PCOS being the leading cause of infertility in the UK, dietary interventions gain importance. The same study noted weight loss averaging 12%, alongside restored menstruation in 2 of 11 previously amenorrheic participants. Eggs at Tesco (£2.30 for 12 free-range) and seasonal British asparagus provide keto-friendly nutrients like choline and folate that support reproductive health.

What This Means in Practice

For women considering keto for fertility, gradual adaptation is key. NHS guidelines caution against rapid weight loss during conception attempts. Monitoring cycles with tools like the keto cycle tracking method alongside blood work provides objective data. Aldi’s fresh salmon (£3.99 for 240g) offers omega-3s linked to improved embryo quality in fertility studies.

Frequently Asked Questions

Can keto help with unexplained infertility?

While not a cure, keto may address underlying metabolic factors. A 2019 review (Paoli et al.) noted ketogenic diets’ potential to modulate inflammatory pathways implicated in some fertility challenges.

How long before seeing effects?

Hormonal changes may begin within 3 months, but full metabolic adaptation often takes 6 months—similar to NHS waiting times for initial fertility consultations.

Are there risks?

Sudden dietary changes during active conception attempts should be discussed with a GP, particularly regarding folate status and pregnancy ketosis guidelines.

The Bottom Line

Current evidence suggests ketogenic diets may support fertility primarily through improving metabolic markers in PCOS and regulating reproductive hormones. The approach requires patience, with effects typically manifesting over several menstrual cycles. For those tracking macros manually, common keto electrolyte mistakes can disrupt progress. If you’d rather not do the macro maths yourself, the Keto Dieting app does it for you on Google Play and the App Store.

Educational only — not medical advice. This article is for general information. Speak to your GP before changing your diet, especially if you have type 1 or type 2 diabetes, kidney or liver disease, are pregnant or breastfeeding, or take medication for blood pressure, cholesterol, or blood glucose.

References

Mavropoulos JC, Yancy WS, Hepburn J, Westman EC (2005). The effects of a low-carbohydrate, ketogenic diet on the polycystic ovary syndrome: a pilot study. Nutrition & Metabolism. https://doi.org/10.1186/1743-7075-2-35
Paoli A, Rubini A, Volek JS, Grimaldi KA (2013). Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) diets. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.116