Which statement best describes the relationship between postprandial glucose and A1C?

Which statement best describes the relationship between postprandial glucose and A1C?

• A. Postprandial glucose contributes significantly to A1C, especially when A1C is near goal
• B. A1C is independent of postprandial glucose
• C. Only fasting affects A1C
• D. Postprandial affects A1C only in type 2 diabetes

Answer: (A)

Postprandial glucose contributes significantly to A1C because A1C reflects the average glucose over roughly three months, incorporating both fasting periods and the spikes that occur after meals. When A1C is near goal, fasting glucose is already close to target, so the remaining rise in the average glucose often comes from those after-meal excursions. That’s why postprandial glucose can be a major driver of A1C in that range. In practice, lowering A1C further often means narrowing the post-meal glucose spikes through dietary choices, timing of medications, or other lifestyle changes. It’s not accurate to say A1C is driven only by fasting, and postprandial glucose affects A1C in many people with diabetes, not just type 2.

Postprandial glucose contributes significantly to A1C because A1C reflects the average glucose over roughly three months, incorporating both fasting periods and the spikes that occur after meals. When A1C is near goal, fasting glucose is already close to target, so the remaining rise in the average glucose often comes from those after-meal excursions. That’s why postprandial glucose can be a major driver of A1C in that range. In practice, lowering A1C further often means narrowing the post-meal glucose spikes through dietary choices, timing of medications, or other lifestyle changes. It’s not accurate to say A1C is driven only by fasting, and postprandial glucose affects A1C in many people with diabetes, not just type 2.