If you had a crappy diet all it would do would be to amplify GD symptoms such as high blood sugars because your pancreas would be over stressed......but the biggest factor in that will be the hormones which impede the effectiveness of the insulin. To put it another way, you have an overweight, crappy diet, biggest loser candidate type person, they will have insulin resistance as the fat cells impede the movement and effectiveness of the insulin cells. If you have a pregnant woman with hormones you have increased insulin resistance. Put the two together and you have a higher likelihood of tipping that particular pancreas over the edge into GD territory. But it doesn't automatically follow that it will occur...it all depends on how much resistance is occuring and how effective that particular pancreas is at picking up the slack.

As a type 1 diabetic my pancreas produces NO insulin of its own so you can see clearly in my body how a pregnancy affects insulin resistance. While I was pregnant I also suffered insulin resistance, EVERY pregnant woman does. My injected doses doubled over time from about 24 weeks till 37 weeks when Bubs was born. I have a friend who is also type 1 and about my size (healthy weight range) and her doses tripled...obviously her hormones affected her more than me....so you can see every person will react differently and I believe differently from one pregnancy to the next.....you can just cannot predict exactly who will and will not be affected by it.

Honeybee.....I wouldn't worry......the fact that you have gone low GI for the rest of the pregnancy will be a good thing and I am sure you and bubs will be fine.....If you are really worried about it the best way to monitor things would be to grab a finger stick blood test machine from the chemist and do a few tests over a few days, both fasting and about 2 hours after meals. These tests over a few days give a far more accurate indication of true GD than a one off blood test can, unfortunately it is not practical or affordable for the medical profession to make all pregnant women do this......compliance with that idea would also be an issue. I am sure you are just fine!