Ran across this on Real Age this morning and find it explains why I sometimes can eat some potatoes w/out a huge BG surge and sometimes can't. For the rest of you struggling with this issue, here's some helpful ideas. Try them to see if they are helpful to you.
Potatoes may be a whole, natural root veggie, but they’re also notorious for causing blood sugar to spike because they're digested into the bloodstream quickly.
To mitigate this negative effect, cook potatoes with a healthy fat, such as olive or coconut oil, and bump up the fiber by adding onions and hearty leafy greens or another vegetable to the mix.
To make potato salad, use plenty of lemon juice and chill it in the fridge. The acid and cold alter the starch molecules in the spuds to slow digestion
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