In my previous two pregnancies I failed the 1-hour glucose test and almost failed the 3-hour. (Was eating SAD.) I desperately want to pass the 1-hour this time.

I've read that going from a very low-carb diet to your pregnancy glucose test can actually cause you to fail it because your body is freaked out (my unscientific term) by the sudden influx of a massive amount of sugar. I've also heard that upping your carbs to about 100-150g per day for a few days before your glucose test can make you more likely to pass.

Any suggestions for which carbs to add? I am debating between beans (kidney, black), white rice, or potatoes. (I am definitely avoiding any and all wheat.) Any particular reason I should pick one (or two) over the others?