Not actually correct. During pregnancy the placenta makes hormones that cause glucose to build up in the blood. The pancreas will normally handle this though by creating enough insulin to absorb that glucose. But if the pancreas can’t make enough insulin or the body stops using insulin as it should the blood sugar levels rise and you get gestational diabetes. It actually has little enough to do with diet. Dietary intake is used to try to control once diagnosed but even then with strict adherence to diet and strict blood sugar levels monitoring many women still find they’ll need medication, especially in the latter stages of pregnancy to control it. There are risk factors of course, obesity and lack of physical exercise being major ones.Actually it’s a major contribution factor… that is why when you are diagnosed with gd your are put on a strict diet……