Quite the opposite. Exercise not only helps control blood sugar but also weight and blood pressure, and will improve cholesterol levels. Physical activity also reduces the risk of common diabetes complications, such as heart disease and nerve damage.

But workouts can sometimes lower blood sugar too much, causing hypoglycemia, especially in people who take insulin or certain long-acting oral medications. To help prevent it, don't work out on an empty stomach, stay hydrated, and talk with your doctor about checking your blood sugar before and after exercise. It's also a good idea to have a snack on hand to bring your blood sugar back up if you start to feel shaky, weak, or light-headed.