Gestational Diabetes is different to a woman with Type 1 Diabetes who is pregnant. Gestational Diabetes affects about two to five per cent of pregnant women. Pregnant women produce large amounts of hormones, which can cause the body to become resistant to the effects of insulin. By the time a woman reaches the end of the third trimester, her insulin requirements have tripled. If the pancreas is unable to match this increased demand, blood-glucose levels start to rise. In most cases, blood glucose returns to normal after pregnancy. However, women who have had Gestational Diabetes have a higher risk of eventually developing Type 2 Diabetes.