2. Corn contains crude fiber and low sugar content, which is an ideal food for diabetic patients. Corn also contains linoleic acid and vitamin E, which can lower cholesterol and reduce the high risk factors of diabetic patients. There are many kinds of corn, such as sweet corn, waxy corn, old corn and tender corn. Different corn has different flavors and nutrients. Sweet corn has the fastest sugar increasing effect, followed by sticky corn, and old corn is the slowest, so old corn is most suitable for diabetic patients.