[Diabetes] Hemoglobin A1c Is Normal, but Is It Still Dangerous!? How to Spot Postprandial Hyperglycemia (Spikes) and Undiagnosed Diabetes[Diabetes] Hemoglobin A1c Is Normal, but Is It Still Dangerous!? How to Spot Postprandial Hyperglycemia (Spikes) and Undiagnosed Diabetes