PCOS affects 1 in 10 women of reproductive age. The dietary advice online ranges from helpful to actively harmful. Here's what the evidence actually says.
Polycystic ovary syndrome is the most common endocrine disorder in women of reproductive age. It's also one of the most misunderstood — particularly when it comes to nutrition.
The Insulin Resistance Connection
Up to 70% of women with PCOS have some degree of insulin resistance, even those who are lean. Elevated insulin drives androgen production, which worsens symptoms. This is why dietary strategies that improve insulin sensitivity are the cornerstone of PCOS nutrition management.
- Low glycaemic index carbohydrates over refined carbs
- Adequate protein at every meal (25–30g) to blunt glucose spikes
- Anti-inflammatory fats: olive oil, fatty fish, walnuts, flaxseed
- Inositol-rich foods: citrus fruits, legumes, whole grains
- Magnesium: dark leafy greens, pumpkin seeds, dark chocolate
Pro tip: Myo-inositol (2g/day) and D-chiro-inositol (50mg/day) have the strongest evidence base for improving insulin sensitivity and menstrual regularity in PCOS.
What the Evidence Does NOT Support
- Blanket low-carb or keto diets — effective for some, counterproductive for others
- Dairy elimination without confirmed intolerance
- Extreme caloric restriction — worsens cortisol and hormonal disruption
- Supplements without bloodwork — iron, vitamin D, and zinc need testing first
“PCOS is not a one-size-fits-all condition. Your nutritionist needs to understand your specific phenotype before making dietary recommendations.
