Does diabetes complications come from plainly just eating to much or just the high sugar itself?

Poor control: Complications of diabetes results from poor control of your blood sugar. In order to avoid complications from diabetes, you must work hard to keep your blood sugar under the recommended levels and maintain an acceptable hemoglobin A1c level. Eating too much can lead to the high sugar levels.

Both: Problems may arise when people consume too much sugar and too many carbohydrates.