Potatoes versus pumpkin: GI does not make the difference

http://well.blogs.nytimes.com/2014/11/07/a-low-carb-switch-for-mashed-potatoes/?

Pumpkin GI 75
Sweet potatoes GI 46 boiled 94 baked, but a more official paper shows:
Glycemic indices calculated from these methods for steamed, baked and microwaved sweet potato flesh were 63 ± 3.6, 64 ± 4.3 and 66 ± 5.7, respectively, indicative of a moderate glycemic index food.
http://naldc.nal.usda.gov/catalog/54010
White potatoes GI 90 and also great variations among cultivars and cooking method