PCOD and PCOS are often used interchangeably, but they are not exactly the same thing. PCOD (polycystic ovarian disease) describes the ultrasound finding of multiple follicles in the ovaries. PCOS (polycystic ovarian syndrome) is a broader diagnosis that requires two of three criteria: irregular or absent periods, elevated male hormones (or their signs — acne, excess hair growth), and polycystic ovaries on ultrasound. Many women with the ultrasound finding do not have the syndrome. But many women with the syndrome have been inadequately investigated and treated.
PCOS affects approximately 15–20% of women of reproductive age in India — one of the highest prevalences in the world, likely driven by a combination of genetic susceptibility and the metabolic environment. It is the most common hormonal disorder in women, the most common cause of irregular periods, and one of the most common causes of infertility. Despite this, the most important fact about PCOS is often not explained to patients: it is a metabolic condition, not primarily a gynecological one. Insulin resistance is at its core, and addressing it is a central part of managing PCOS.
Why insulin resistance matters so much
In PCOS, excess insulin stimulates the ovaries to produce more androgens (testosterone and related hormones). Elevated androgens disrupt follicle development, preventing eggs from maturing and being released — causing irregular periods and sometimes anovulation (cycles where no ovulation occurs). The follicles that fail to ovulate accumulate in the ovaries, creating the polycystic appearance on ultrasound.
Insulin resistance in PCOS is often not detected on a standard fasting glucose test. The more sensitive tests are HOMA-IR (derived from fasting insulin and glucose) and the insulin response to a glucose challenge. Many women with PCOS have normal fasting blood sugar but significantly elevated insulin levels — indicating insulin resistance that standard testing misses.
This explains why the main approaches to managing PCOS address insulin resistance: dietary changes (particularly reducing refined carbohydrates), exercise, and medications like metformin. It also explains why PCOS symptoms often worsen with weight gain and often improve with even modest weight loss.
What diet change actually does
The dietary change with the strongest evidence in PCOS is reducing the glycemic load — the speed and quantity with which food raises blood glucose, and therefore insulin. This means reducing refined carbohydrates (maida, white rice in excess, sugar, sugary drinks, processed snacks) rather than total carbohydrates. Complex carbohydrates with fiber (whole grains, dal, vegetables) raise insulin much less than refined carbohydrates in the same quantity.
A low glycemic index diet in PCOS has shown reductions in fasting insulin, testosterone levels, and menstrual irregularity in randomized trials. The effect in these trials was meaningful. Results vary from person to person, so it is worth working with your doctor or dietitian.
Protein adequacy matters too. Adequate protein at each meal slows gastric emptying and blunts the insulin response to carbohydrates eaten alongside it. For vegetarian patients this means ensuring dal, paneer, curd, or legumes are present at every meal — not just at dinner.
Inositol (specifically myo-inositol and D-chiro-inositol) deserves mention. These are naturally occurring compounds found in foods including whole grains and legumes. Supplementation with myo-inositol (2–4 grams daily) has good evidence for improving insulin sensitivity in PCOS, reducing testosterone, improving cycle regularity, and improving egg quality in women trying to conceive. I consider it one of the most evidence-supported supplements in PCOS management.
Exercise — not just weight loss, but hormone change
Exercise improves insulin sensitivity independently of weight loss in PCOS. Both aerobic exercise and resistance training have evidence, but resistance training may have a particular advantage: building muscle mass creates more tissue for glucose uptake, reducing insulin demand more durably. The combination of both types of exercise produces the best metabolic outcomes.
The minimum effective dose is 150 minutes per week of moderate-intensity aerobic exercise, or 75 minutes per week of vigorous exercise. Patients who add two resistance training sessions per week on top of this see the largest hormonal improvements. The effect on menstrual regularity from consistent exercise is significant — some women see cycle improvement within six to eight weeks.
Weight loss — and why the amount matters less than expected
In women with PCOS and excess weight, even a 5% reduction in body weight improves insulin sensitivity, reduces androgen levels, and often restores menstrual regularity. This is a smaller threshold than most patients expect, and it is meaningful. A 5% weight loss in a 70 kg woman is 3.5 kg — achievable with consistent dietary and exercise changes over two to three months.
The quality of weight loss matters too. Crash diets cause temporary improvement followed by metabolic rebound. The goal is fat loss (specifically visceral fat) while preserving or building muscle — which requires adequate protein and resistance training alongside calorie reduction.
Stress and cortisol in PCOS
Chronic stress worsens PCOS through two pathways. First, cortisol promotes insulin resistance directly. Second, HPA axis dysregulation in chronic stress contributes to adrenal androgen production, worsening the androgen excess that drives symptoms. This explains why PCOS flares are commonly described during exams, work stress, and family conflict — and why stress management is not an optional add-on but a genuine therapeutic component.
When medication adds value
Metformin improves insulin sensitivity and reduces androgen production. It is a reasonable first medication for most women with PCOS, particularly those with confirmed insulin resistance or those not responding to lifestyle change. Oral contraceptive pills regulate cycles and reduce androgen symptoms (acne, hair growth) but do not address the underlying insulin resistance — they manage symptoms while the metabolic issue continues. This is why stopping the pill often brings all symptoms back, sometimes worse.
For women trying to conceive with PCOS, inositol plus metformin plus lifestyle change is often sufficient. For women who are not ovulating despite these, letrozole or clomiphene stimulate ovulation with reasonable success rates.
The longer-term picture
PCOS is not just a reproductive-age problem. Women with PCOS have a significantly higher lifetime risk of type 2 diabetes (up to 10-fold in some studies), cardiovascular disease, and endometrial cancer (from prolonged anovulation and unopposed estrogen). Regular monitoring — fasting glucose, lipid panel, blood pressure annually — is appropriate for any woman with PCOS from her twenties onward. This is the conversation that often does not happen in a gynecology appointment focused on fertility or cycle regulation.
Treating PCOS as a metabolic condition from the time of diagnosis — not just when trying to conceive, not just when cycles are very irregular — is the approach most likely to improve quality of life now and reduce long-term disease burden.
