Prediabetes affects approximately 60 million people in the United States alone. Left untreated, the condition can lead to diabetes and serious long-term health problems. Prediabetes can be stopped and even reversed through changes in diet and exercise. Get healthy by figuring out whether you’re at risk for prediabetes; knowing what blood glucose levels identify prediabetes and diabetes; having other medical tests done to monitor your health; and improving your eating habits.