Prediabetes is a borderline condition in which your blood sugar is consistently high but not high enough to be considered diabetes. The easiest way to determine if you have it is to get a simple blood test. The most accurate one is the A1C test, which determines the percentage of glucose (sugar) that's attached to the oxygen-carrying protein hemoglobin in your blood.
"It's a good indicator of what your blood sugar has been like for the past two or three months," says Loren Wissner Greene, MD, a clinical professor and endocrinologist at NYU Langone Medical Center. A score of 5.9 and below is considered normal. Anything between 5.7 and 6.4 is considered prediabetes, and 6.4 and above is full-blown diabetes. (Eat to lower your cholesterol and blood pressure—and lose up to 25 pounds in the process—with