Well, there are small turnips - sort of white with purple tops. Then there are bigger ones which are yellowish with purple tops and keep for the winter. The last are the rutabagas or "Swedes".
The bigger ones are probably higher GI than the small ones BUT they are still much lower than beets and parsnips. One cup of cubes has 38 calories, 8 carbs and 2 grams of fiber. That is probably why the Guide lists them as good and lists beets and parsnips as limited and very limited respectively.
I hope this clears this up.
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