If you've never tried a low-carb kiwi, you might not know that its brown fuzzy peel hides a zesty bright green fruit. Delicious kiwi is a good source of potassium, fiber, and vitamin C. One large kiwi has about 56 calories and 13 grams of carbohydrates, so it's a smart addition to your diabetic diet. Kiwis are available year-round and will last in the refrigerator for up to three weeks.