Diet is one of the most effective PCOS interventions. Here's exactly what helps — and what doesn't.
Polycystic ovary syndrome is primarily driven by insulin resistance and androgen excess. Diet affects both of these directly — which is why what you eat can either significantly improve or worsen PCOS symptoms. This isn't about calorie restriction; it's about choosing foods that stabilise insulin and reduce inflammation.
Around 70% of women with PCOS have insulin resistance — cells that don't respond properly to insulin, causing the pancreas to produce more. Excess insulin signals the ovaries to produce more androgens (male hormones), which suppresses ovulation and causes the symptoms we know as PCOS: irregular periods, acne, excess hair growth, hair loss.
Eating to improve insulin sensitivity — lower glycaemic index foods, adequate protein and fat, reduced refined carbs — directly addresses the root mechanism, not just the symptoms.
Leafy greens, broccoli, cauliflower, courgette, peppers — high fibre, low glycaemic impact, anti-inflammatory. Fill half your plate with these at every meal.
Salmon, sardines, mackerel (omega-3s reduce inflammation and improve insulin sensitivity). Chicken, eggs, legumes provide protein without glycaemic spikes.
Berries, green apples, cherries — sweet enough to satisfy cravings but low enough on the glycaemic index to not spike insulin the way tropical fruits or juice does.
Avocado, olive oil, nuts, seeds — fat slows glucose absorption, improves hormone production, and reduces inflammation. Including fat at each meal prevents insulin spikes.
Oats, quinoa, barley, brown rice — fibre slows glucose absorption compared to refined carbs. Small portions with protein and fat rather than large portions alone.
| Day | Breakfast | Lunch | Dinner |
|---|---|---|---|
| Monday | Greek yoghurt + berries + walnuts | Salmon salad with olive oil | Grilled chicken + roasted veg + quinoa |
| Tuesday | Eggs + spinach + avocado | Lentil soup + whole grain bread | Baked salmon + broccoli + brown rice |
| Wednesday | Oats + chia seeds + blueberries | Chicken salad + olive oil dressing | Turkey stir-fry + courgette noodles |
| Thursday | Smoothie: spinach + berries + almond butter | Tuna + cucumber + wholegrain crackers | Lemon baked cod + asparagus + quinoa |
| Friday | Scrambled eggs + tomatoes | Greek salad + grilled chicken | Beef + vegetable stew + barley |
| Saturday | Avocado toast (wholegrain) + egg | Chickpea and vegetable curry | Grilled mackerel + roasted peppers + salad |
| Sunday | Chia pudding + mixed berries | Leftover curry with brown rice | Roast chicken + root vegetables |
Log what you eat alongside your cycle and symptom data. See what actually makes a difference for your PCOS. Free.
Start free →A low-glycaemic, anti-inflammatory diet is most effective for PCOS — focused on non-starchy vegetables, lean protein, healthy fats, and whole grains while minimising refined carbohydrates and sugar.
Yes — because 70% of PCOS is driven by insulin resistance, eating to stabilise blood glucose directly addresses the root mechanism. Studies show low-GI diets reduce androgen levels and improve cycle regularity in women with PCOS.
Diet is highly effective for managing PCOS but may not be sufficient on its own, especially in more severe cases. It's typically most effective alongside regular exercise. Medical treatment may also be appropriate — discuss with your doctor.
Evidence is mixed. Some women with PCOS report improvement in acne and androgen symptoms when reducing dairy; others don't. It's worth trialling a 4–6 week dairy reduction to see if it affects your symptoms.