Green grapes are more than just a convenient snack. They are packed with potassium and fiber, which can help lower high blood pressure by regulating your cardiovascular system. Green rapes are a high-fructose food, so eating too many grapes can spike your blood sugar levels, especially if you have type 2 diabetes or fructose intolerance. Pay attention to your portion sizes and limit yourself to 4-5 servings of fruits per day.