Please explain why.. if my estimated mean plasma glucose is 110.47 mg/dl from lab converts to a1c of 5.9% ..that doesn't seem to correlate. fasting 79?

Average of the day: Your fasting glucose is fine. Your blood glucose goes up after eating. The estimated mean plasma glucose takes into account the peaks in blood glucose after eating. 79 is the lowest. When averaged with higher, post-prandial levels you get an estimated reading that would be higher. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.

Meaning of it all: The A1c tells how much glucose is stuck on the hemoglobin in the red blood cell. The higher the blood glucose was during the life span of the cell (120 days), the higher the A1c. So, 1 fasting level of 79 will not tell you if the glucose is too high for too long after a meal, or if you used to have higher glucose but it got better recently through weight loss or medication.