Metabolic health and fertility

South Asian women have significantly higher rates of insulin resistance, type 2 diabetes, and metabolic syndrome, and these conditions directly impact fertility. Yet this connection is rarely explained to patients in a way that empowers rather than frightens.

This isn't about blaming your body or your diet. It's about understanding a biological link that affects millions of South Asian women and knowing what you can do about it.

Up to 70% of women with PMOS have insulin resistance, and this figure is even higher in South Asian women. Insulin resistance means your body produces insulin but can't use it efficiently. The result: higher insulin levels, which stimulate the ovaries to produce more androgens (male hormones), which disrupts ovulation.

This is why PMOS, weight gain, irregular periods, and difficulty conceiving are all connected. The root issue is often metabolic, not just reproductive.

South Asian women develop these metabolic complications at lower body weight than White European women. The standard BMI threshold of 25 for "overweight" underestimates risk in South Asian populations, where complications can begin at BMI 23.

Vitamin D deficiency is very common in UK South Asians, published UK cohort studies have reported rates ranging from around 55% up to 94% depending on season, ethnic subgroup, and lab cut-off. Higher melanin reduces vitamin D synthesis from sunlight, and UK latitude limits UV exposure from October to March.

Vitamin D plays a role in reproductive health, deficiency has been associated with PMOS severity, insulin resistance, and pregnancy outcomes. Addressing deficiency is a simple, low-cost step that may help alongside other lifestyle work, it is not a fix for fertility on its own.

Ask your doctor for a 25-hydroxy vitamin D blood test. Your doctor or pharmacist can advise on appropriate supplementation. Public Health England recommends 10 micrograms (400 IU) daily for all UK adults during autumn and winter; higher doses may be needed to treat confirmed deficiency.

Traditional South Asian diets contain both protective and potentially harmful elements: Protective: • High vegetable intake in many cuisines • Lentils and legumes, excellent protein and fibre • Spices (turmeric, cinnamon, fenugreek), some evidence for anti-inflammatory effects • Fermented foods in some traditions Potentially harmful for metabolic health: • High refined carbohydrate load (white rice, white flour rotis/naan) • Large portion sizes culturally linked to hospitality and love • High sugar in chai, mithai, and celebratory foods • Cooking oil and ghee quantities • Iron and B12 deficiency risks in vegetarian diets • Late-night eating patterns

You don't need to abandon your food culture. Small, sustainable changes, switching to brown rice, reducing sugar in chai, increasing protein at each meal, taking B12 and iron supplements if vegetarian, can measurably improve insulin sensitivity and hormonal balance.

If your mother had gestational diabetes, type 2 diabetes, or PMOS, your own risk is higher. This isn't destiny, it's information. Knowing your family metabolic history helps your doctor assess your risk accurately.

The dietary and lifestyle patterns passed down through generations, the recipes, the portion sizes, the attitude to exercise, are part of this picture. Understanding this helps you make informed choices without guilt.