Polycystic ovary syndrome (PCOS) affects approximately 1 in 10 women of reproductive age — making it the most prevalent endocrine disorder in women globally. Despite this, the average woman with PCOS waits more than 2 years for a diagnosis. Understanding the condition is the first step to managing it effectively, and the good news is that lifestyle has a profound impact on its expression.
What PCOS Actually Is
PCOS is defined by the Rotterdam criteria — diagnosis requires at least 2 of 3 features: polycystic ovaries on ultrasound (12+ small follicles per ovary), irregular or absent ovulation (oligo- or anovulation), and clinical or biochemical evidence of elevated androgens (testosterone excess). The name is misleading — the “cysts” are not true cysts but incompletely developed follicles that failed to ovulate and remain in the ovary. PCOS is a syndrome with considerable phenotypic variability — two women with PCOS can have very different presentations.
The Central Mechanism: Insulin Resistance
In approximately 70% of women with PCOS, insulin resistance is the central metabolic driver. When cells resist insulin, the pancreas compensates by producing more. Elevated insulin directly stimulates the ovarian theca cells to produce excess androgens (particularly testosterone), while reducing sex hormone-binding globulin (SHBG) — which normally keeps testosterone inactive. The result: more free testosterone circulating, driving acne, hirsutism, hair loss and ovulatory disruption. This is why interventions that improve insulin sensitivity — exercise, low-GI diet, weight loss, metformin — are so effective for PCOS.
PCOS Symptoms and Their Causes
Irregular periods — disrupted FSH/LH signalling and androgen excess prevent regular ovulation. Acne — androgens stimulate sebaceous glands. Adult, lower-face-predominant hormonal acne in women is strongly associated with PCOS. Hirsutism — unwanted hair on face, chest, abdomen, from androgen excess. Androgenic alopecia — scalp hair thinning from DHT. Weight gain and central obesity — insulin resistance promotes visceral fat storage. Fatigue and energy fluctuations — blood sugar instability from insulin resistance. Mood symptoms — depression and anxiety are 2–3× more prevalent in PCOS, partly hormonal, partly the psychosocial burden of the condition.
Diet and Lifestyle: The Foundation of Management
A low-GI, anti-inflammatory diet is the most evidence-backed dietary approach. Key principles: prioritise complex carbohydrates (legumes, oats, wholegrains, vegetables) over refined carbohydrates and sugar — this reduces insulin spikes directly. Include adequate protein at every meal. Increase anti-inflammatory foods (oily fish, berries, leafy greens, turmeric, walnuts). Reduce ultra-processed food and sugar-sweetened beverages. Even modest weight loss of 5–10% in women with PCOS who are overweight significantly reduces insulin resistance, lowers androgens, improves cycle regularity and restores ovulation in many.
Supplements With the Strongest Evidence for PCOS
Myo-inositol (2–4g daily) — the most evidence-backed OTC intervention for PCOS. Multiple RCTs show insulin sensitising effects, reduced free testosterone, improved ovulation regularity, and reduced LH:FSH ratio. The 40:1 combination of myo-inositol to D-chiro-inositol mirrors physiological ratios in healthy ovarian follicles and may be more effective than either alone. Berberine (500mg 2–3×/daily with meals) — comparable to metformin for improving insulin sensitivity and lipid profile. Avoid in pregnancy. NAC (N-acetylcysteine, 600mg daily) — improves insulin sensitivity and reduces testosterone. Omega-3 (2g+ EPA+DHA daily) — reduces inflammation, lowers triglycerides and improves insulin sensitivity.
Frequently Asked Questions About PCOS
Does PCOS mean I can’t have children?
No — PCOS is a leading cause of subfertility (reduced fertility), not infertility. Many women with PCOS conceive naturally. Lifestyle interventions (weight loss if indicated, myo-inositol) can restore ovulation in many women. When needed, medical treatments — clomiphene, letrozole, metformin, IVF — are very effective for PCOS-related subfertility, with generally good success rates.
What tests confirm PCOS?
A GP will assess: clinical history (period regularity, symptoms of androgen excess), blood tests (LH, FSH, total and free testosterone, SHBG, prolactin, thyroid function, fasting insulin and glucose), and pelvic ultrasound. Not all investigations will be abnormal in every woman — PCOS is diagnosed on the Rotterdam criteria, not on laboratory values alone. Thyroid disease and hyperprolactinaemia should be excluded as they can mimic PCOS.
Is the pill the best treatment for PCOS?
The combined oral contraceptive pill effectively manages some PCOS symptoms: it regulates periods, reduces free androgens (improving acne and hirsutism) and protects the endometrium from unopposed oestrogen. However, it doesn’t treat the underlying insulin resistance — and some progestogens in the pill worsen insulin sensitivity. It’s a valid symptom management approach but works best alongside lifestyle interventions addressing the metabolic root cause.
What are the long-term health risks of PCOS?
Unmanaged PCOS with persistent insulin resistance significantly increases: Type 2 diabetes risk (5–10× higher lifetime risk), cardiovascular disease risk, endometrial cancer risk (from repeated anovulatory cycles with unopposed oestrogen — addressed by regular withdrawal bleeds or progestogen treatment), sleep apnoea, and NAFLD. These risks are substantially modifiable through active management of insulin resistance.
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