I say "tom-ay-to," you say "tom-ah-to," but what really matters is how many you eat. No matter how you slice it, tomatoes are terrific for your blood sugar. These juicy fruits are incredibly low in calories (just 22 per tomato) and carbs (less than five grams each). What's more, they're rich in vitamin C, which helps protect the body from blood sugar damage, and lycopene, a member of the carotenoid family along with beta-carotene.