I have PCOS also. I was diagnosed at 20 years old and was told I would not have kids without fertility treatments. At the time, I was 50 lbs overweight, living in Texas eating all the wonderful southern foods and not very active. I had a cyst surgically removed from my ovary because it was the size of a grapefruit. I refused to take Metformin. Fast-forward 4 years later, I moved back to Canada and decided to take charge of my health, working out 6 days/week and eating 6 small meals/day to keep my blood sugar stable - more protein than carbs and lots of veggies. I lost 50 lbs and ended-up getting pregnant (surprise!). My doctor here told me "Oh yeah! With proper diet and exercise, the insulin resistance goes away, making it easier to conceive". Who knew? (Side note: I also have hypothyroidism. Have you had your thryoid checked? They often go hand-in -hand and may further explain your difficulty losing weight.) I know each person is different and I am not saying you will be able to conceive, but it is worth examining your diet to see what and how often you're eating. Work-up a good sweat for at least 30 minutes/day. The results will come, at least in terms of weight loss.
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