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A personal comment - I first realised I had PCOS when reading about it as a medical student and recognising all the relevant symptoms/signs in my physiognomy. It was confirmed years later with blood tests and scans when I was being treated for sub fertility. Over years of trial and error in my twenties I learnt to control my weight and was just able to avoid gestational diabetes ( during pregnancies achieved via ovulation induction), but my babies were all big. I've been pre-diabetic for the past 5 years, with an upward trend in HBA1C, because I was lax about weight control and let my BMI go up to 26. Recently I reduced this to 23 and my HBA1C fell from 47 to 43. How? Carbohydrate restriction. I recommend the Diabetes UK advice on this, and suggest it should be promoted to PCOS patients.