What do you know about Prediabetes? Prediabetes- higher than normal glucose levels but not yet diabetes People with prediabetes are likely to have no symptoms.  Unusual thirst, frequent urination, blurred vision and fatigue are all symptoms of full blown diabetes, but these are not likely to appear until the disease is advanced. Who should be tested for prediabetes? People who are overweight and age 45 or older should talk with their doctors about being tested. How much more likely are people with prediabetes to develop diabetes? Five to 15 times more likely. Three lifestyle changes that can often keep prediabetes from progressing to ...