Elma yes that's what I've read too, it needs to be a specific amount of whatever food you use.
NDH I agree, if you never drink soda or juice or eat much sugar, then suddenly overload your system with a super sugary drink, of course your levels are going to be high, that's why I think the GD test gives a lot of people false positives. I'm no expert but I don't see why you'd need a tolerance to that high an amount of sugar if you don't typically even eat that way. They are basing the test on the standard diet which has way too much sugar in it to begin with, and I don't think a one size fits all test is appropriate. If someone were to get a false positive for GD, that opens them up to the label of "high risk" which can bring along a whole host of other interventions.
I don't think drinking the Glucola one time is going to be so harmful that it causes birth defects or harm you in any significant way, but I just think it's counterproductive to drink that processed, artificial coloring and flavored laden drink when I'm trying really hard to only put very healthy things in my body and doing a lot of things to avoid chemicals in my daily life. Not that it's the mothers' fault, but it's (another) issue I have with Western Medicine. I think there are lot of "harmless" products that when added all together are anything but. I do think it contributes to the toxic load on your body, which won't really harm you if you are generally healthy but for some people who are already loaded up with toxins it may. I've read stories about the mother drinking it and about 5 minutes later feeling her baby going nuts flipping around and obviously all hyper.. that kind of sugar overload also affects the baby. And I believe refined sugar is a poison for the body. For me, if there is a healthy, natural option to achieve the same result - finding out how your body processes sugar - then why not.
I don't blame anyone who drinks the Glucola of course, it's easiest and it's most likely not going to hurt you, and everyone's doctors are more comfortable with it, but I personally just tend to be very skeptical about a lot of "standard" products and procedures, and I don't have much trust in allopathic medicine obviously. I tend more towards Naturopathic Medicine as I feel it is more accurate and comprehensive, as well as evidence-based whereas a lot of Western Medicine practices are based on established methods (habit) or convenience/cost-based, and are inflexible to new science. But anyway, off my soap box now