Mainly, diet. This is a disease of metabolism problems, that is, how the body breaks down and uses carbohydrates in food for the energy we need. In diabetes, a few problems can exist: if our pancreas still produces insulin, if it produces enough, if our body's cells are able to
open up and use the blood sugar in the system for energy, etc.
Patients would have a blood sugar meter which measures blood sugar so they can check their levels. They may do this a few times a day.
There are different 'levels' of diabetes: diet-controlled, oral medication-controlled, insulin-controlled. If blood sugar levels aren't critically high, patients who lower their carbs and are very active (exercise, walk, jog) can control their blood sugar with just diet and exercise. If diet and exercise still can't control blood sugar, then the doctor will prescribe some sort of oral medication.
Check out the stickies at the top of our forum for more specific information. I think that if you were just on a temporary dosage of prednisone and have ended it, your blood sugar may have already gone down to normal. You need to have it tested. Can you go back to the doctor's office or a pharmacy to get it tested?