Your middie is not quite correct if that is what she said. A low GI diet is great if you are wanting to avoid or treat any form of diabetes but in will in fact trick the test if it is not a diet that you follow everyday. The test is trying to see how your pancreas handles stress which is why most labs get you to go on a carb loading diet for the few days beforehand...they are trying to see how your pancreas handles the stress and how insulin resisitant you have become. By going easy on the carbs for the few days beforehand and resting your pancreas you actually put it in better position to handle the glucose load of the GTT.

So your pancreas would actually give a better result than if you had followed your normal diet or the carb load diet in the few days before and used up the insulin stores. That is why they carb load you...to tip the pancreas over the edge....

Having said that I wouldn't stress too much about it.....you will either have it or you won't....gestational diabetes unlike type 2 is not realy diet related, it is very much hormone driven. your placenta is producing a whole heap of growth hormones that make you insulin resistant at this stage of the pregnancy...This places extra demand on the pancreas to produce extra insulin to do the same job it normally would.....most people's pancreas' can keep up with the extra workload, for some it is too much and they show signs of high blood sugars or GD. As a guide your body has to produce 2-3 sometimes 4 times as much insulin as when you are not pregnant to metabolise the same amount of food. Some people need twice as much and cope well, some need four times as much and get GD.....it is mostly a result of the hormones and nothing whatsoever to do with weight, diet, lifestyle etc.....

And having said all that...we should all follow a low GI diet all the time then we would all have nice stable blood sugars and no sugar cravings or related mood swings....imagine how much happier the world would be?!!! LOL
Thanks so much for the info! I actually spoke to my gp about this yesterday and he said the same as you! So I called my midwife, and I kid you not, I got: "Well yes technically it may trick the test a little, but that's what we want, isn't it? You won't have it anyway so there's no harm."

Um NO I said. I want accurate results. I want good care. Yep I want a Homebirth but at what cost, to compromise test results, no. If I did have GD (soooo unlikely) I would probably hire an IM and still have my HB. I was a little shocked actually.

God I am so uninformed ATM lol. Not like me. So if I had a crappy diet would that sway the results too? (I don't!)