Why do potatoes have a high glycemic index (GI)?

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Offline glovesforfoxes

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Why do potatoes have a high glycemic index (GI)?
« on: 06/12/2009 02:46:22 »
It seems, since they're starchy, that they shouldn't. Can anyone explain why they are?
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Offline DrN

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Why do potatoes have a high glycemic index (GI)?
« Reply #1 on: 07/12/2009 21:46:49 »
Starch is polysaccharide, so it's made up of long chains of sugar molecules (glucose). When it's digested, it's basically turned into sugar, hence the high glycaemic index.

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Offline glovesforfoxes

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Why do potatoes have a high glycemic index (GI)?
« Reply #2 on: 08/12/2009 00:10:11 »
I figured it would take longer for the digestive enzymes to break the starch down, but I guess the high heat in cooking does that in part anyway. Cheers DrN.
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Offline Nizzle

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Why do potatoes have a high glycemic index (GI)?
« Reply #3 on: 08/12/2009 06:23:39 »
Starch is one of the few things that doesn't wait to get to the stomach to be digested but is already being digested by saliva...

You can do a "kitchen experiment". Keep a small potato in your mouth for quite some time, and it will slowly start to taste sugary
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