According to a health newsletter from HSI's Dr Ferril - Sept '09 issue [just received]
foods hugh in Potassium are supposed to be of special benefit to Diabetics.
Foods mentioned are bananas, apricots, avocadoes, spinach, potatoes, meats and fish.
Supplementation w/extra Potassium is recommended too, as Diabetics lose alot of both Magnesium and Potassium from frequent urination.

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May you always have..Love to Share, Health to Spare, and Friends that Care!

If the carbs are not a killer: Coconut water is loaded with potsassium and has a fair amount of magnesium.